Physics Unit23: Light and Geometric Optics - 无忧得胜-网上国际课程 (5edu.win)

1#

Reflection, refraction, and the formation of images by mirrors se4a2yr +6i h9-y auq5wj1pleand lenses has been successful descr lu4 rja 1ypiweqy+e96s-h5 2aibed by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidence saj1n)ef6 w u4ey2a-k

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on whii a:83:newr ntch mirrors work is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms-cujoj.+ps( me kl:8l an image that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors producedi;*y.zk y q1-;/q+p4xb kpcr sjp;k r images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays dol1amf 5uc, x1t not actually pass through the image location, and would not appear on pap u51ac fl1,xmter or film placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through the image locatbky,t;lpvf /*p6 tbdwm64n s rh8-r w5ion, and could appear on paper or film placed at the that lo 6fprswvth,tp;6wb-l8 k/yd 5* nrb4 mcation is referred to as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to se9ho8ronq.fgi;: 6oecr 6 zz0x e a virtual image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outl /thdw iuz)g,n9ebq x9x. e)5er surface of the spherical lqx.9iwx d)h ,b/ 9)tgeeun5zshape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner surface of the su6v)*go rc 7+)3mtdk7zxcv zsphere isd )cv+rcxu3s*vz7) z mok6 g7t referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature of the concave mtbq1 a4y) k,soirror is r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling p -zq r/2s//d.vsupx..h ozk akarallel to a concave mirror's axis, strikes the mirror's surface near itu.dk/z2s .szv / ao.q-xpkrh/s midpoint. After reflection, this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to the axis is r0 e8ty/iv tr-oeflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a k4 arml98t*h/t:eil pconcave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface.eitm a t/9rk8h:p4ll* After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the center of curvwl80 /hvclmnby sy;c:kr43, wature is reflecte;m4 wb,nw0l3hcklr v8 : cy/syd

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's surfac;:hp1ebe1b bge, crosses the axis at the mib1h ;pb1g:be error's focal point before striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a 9 r)l.3o/ahs mtkk .zsconcave mirror on a path through the focal point is reflectezmah. s s3okt /)9krl.d

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the tsjgc9j(dr -r1fpx .iig j/,)zhree rays for finding the image position due to a curved )gr j. z9- s,rgp1(ji/dfcixjmirror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exacth0xt 7o guj5d;ly at its focal point,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image, and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concavo*54f*d 02 jkzxcwd,i br5hqkft *3q he mirror's center of curvature. The image produced by tj 2hbio,0h3k*x*z*rq ct q5kwf fd5d4he mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned betwe.ne .2 ;j5: gbzkcvysfen a concave mirror's center of curvature and its focal 5fvec.j kzn s.b2g;:y point. The image produced by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror's surface imd5dba 9 l20jua 2eg8and its focal point. The image formed in this cas g2ib me5j8u0dl92aad e is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front iyoj*o3 :it+iz+ih,c of a convex mirror, at the same distance from it as its radi+:j,*+ii3 yi zhotiocus of curvature,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance from it as ikudabm7s g600b1wa3 fts fo1u bm6w0 asad073 bkfgcal length,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curvedk cwfp:ec9q0 6 mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at c:ew k06pqcf 9the bottom (convex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrors pr)b at9ft+os +8gsmm v)oduce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produce imagesixou /gm3iw/pxy d,39 which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produci/ z0p3vzm; znes an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex sphersi93p+a;4 3wg m lozumical mirror produces an image which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification formpprorc;r3p xi so5hn a9hior/- ) 3*-r7hnx: a mirror means

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distanc6jtv;lrb c .h3e is positive, the image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negative, the ulgfmq iv+( ),image formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a posk 5*hlwhjs:z cx-4gh9+bls ) t2 s)rvfitive value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a negative 0bhaqo ck+9 (svalue, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnific82p b k68salfjation is larger than one, then the image isb k8aj8f26s pl

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the mag1h s+qn3 w, )ckfh;htunification is smaller than one, then the image is);cqt3nus fk1w+ ,hh h

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal to one, thej/o(kg ,*8mt x blcs mft8s95un the image is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastest f o*tli;w8pr/

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substances, the index of. bq+:f5()sdjbht (i6rxhh o k refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than one for a medium dqp:xqz0mmp8.fyt/ ) would imply

A. that the speed of light in the medium is the same as the speed of light in vacuum.

B. that the speed of light in the medium is greater than the speed of light in vacuum.

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of diamondwnc 4f5ufo8y- f4vn )q is $2.42$. This means that a given frequency of light travels

A. 2.42 times faster in air than it does in diamond.

B. 2.42 times faster in diamond than it does in air.

C. 2.42 times faster in vacuum than it does in diamond.

D. 2.42 times faster in diamond than it does in vacuum.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidencw35jii5q2lu*:nyk- f8 ct xo 9i)gb kne

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into a den n o ,pi+z7sud-6c6zehser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. Th+gcudncztz )+yn x -50e angle of refraction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident onybb:5 f zi . yzp9vn9ufsu(k2* a glass plate at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber opti7 -.c;stl*hzb3sek(0ziokn0. hgz zmcs is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing from water int7zk3j3 z4t(lhs +xqi: rfz. jxo air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lesf2r( pqv4p18 j:u gltnses work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at the center calltzpy+k,l,8/7anng tu +bsq i-ed

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than the edgb2r6bs;4a y)c0onbkbdvs - : res are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker at th,jmm 0l u)s5p(hptjx+e center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar excbrv mm:szkb )1h6x 5fq i,m9*lajn.2 tept that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. b: xqhamfl.m ,952 t v1rmszn6*ikj)b The focal length of lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave lenz/+k8 gakhu /gs, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling oblique8/kua /h+gkgz ly to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a convex thin lens, strikes t y4mu df+h2vhj jkthjava1geo.. *+/2he lens near its midpoint. After traveling through the le.t+.o hjv m*2/jajkg4veu dyhfa1 h2 +ns, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding the)qv9zk vm ue-xw/o1 u j24w2t trl,z)zi:gvz( image position due to a thin lezo9 vexm r uvq 1lz,)tvzgwwu(z t2/i4:2k) j-ns.

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has focam+ga3otrj/w-jz0z g .,e /yvql length $f$. An object is located at infinity. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lxh;x4lh ;pl/ qength $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focanvkh1 ,ms ot/9l length $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal v+p k1 yais+h)length $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focalv 9r-rooh5 ehp.i2.t r length $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex lens and its focal point. The image formedv.;4h jy01 vh icu.xzf zcv1f yvj4h0xu.;ih .is

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by conc /wmg5g 266fblbi2pjiave lenses

A. are always real.

B. are always virtual.

C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.

D. could be real or virtual, but always real when the object is placed at the focal point.

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare stamp you see throucx;b spt64y25u -gdmv gh a magnifying glass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen. Between the lamp and the screen is placed2u;rm- )dw 21olfnmuj;b k5-luat 8qm a converging lens of focal length 2u;b1jlmo 2td2-qw-nkuum5 al fmr) 8;4 cm. The filament of the lamp can be imaged on the screen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of focal lmdhgwf 8ncj( h(z 9vi7o,gi /8engths $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) lenses are placed in contact. 5f1ckl7-i gw fIf each has a focal length of 20 cm, how would you expect the combination to funcf1l5 wkgfic-7tion?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a plane's reflecting surg;)1i cxs yvt1l3g:e1wb ,jmpface with an angle of incidence of :glb t 1p;3c1iy) vesjgm,1xw $52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front 2dyi,-i 6xxrsof a plane mirror. The image formed by the mirror appears toir -s,6i dyxx2 be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you fromew jg t41 5j wduvc-tly;pn)-, your image when you stand 0.75 m in front of a vertical plane 5v-tdj g)4- t1,uj;pe cw nwlymirror?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach your imaa2ypvmp6zj/g7v 5y7 bge when you approach a vertical plane mirror at a speed of 2mv7vgp 6 2a/y 5bzpyj7 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has a radi*7k* :cco sbrg42/ phz nfb7fxus of curvature of 20 cm. How far from the mirror is thzsnx:cbo7fc kp4 r *hf*72/bge focal point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creates a real image 30 cm yup44uezrcpp 0j7asu gb;kn(:5 3 v9p from the mirror. Wv 4 ybppp 43: j5u r9(ze;s7ncuug0kpahat is the object distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirrorw8jqzr j54 vwlir9; q3, and the image is 3.0 cm in front of the mirror. What is the focal length ofivw ;z84 rlq93jrqwj5 the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirrmpuhb x,x0a0f/o,x* me.vz5mor with focal length 3 cm. Where is t/mbfxx. o u,5 e0hmm0*pzv,x ahe image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 2ns /y5m.h 3*m awe+yo 8xrhng20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image e.8 h3r yn+g5x yao /*wsnmhm2located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. w/jb z6z(efbcdp 8p*c8 ,ah c* An object is placed 30 cm in front of the mirror on the mirror's */,p *d( f wczbz6cebj8phc8aaxis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from,s j-fly.g4b)q *+1dd9 pone 0avw yoa a concave mirror. The image is 4.7 cm tall, and 10 cm from the mirror. How tall is the on*og,apdbwoy0qv-f+1d)a j4s y9e. lbject?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal leno*tapw5 xgdkcg;,hi 62u+ (dws)fab 9gth 20 cm. The object is 4.0 cm tallhdf, x6)au(9 baiwpd5sc* ;g+wk 2 got. How tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image ii1wfweiy/ojd*653 (m/sns .s c my.kys 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from the miry yje3iwomwd5.ys/ c.6*s i (k f1smn/ror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4.0 cm from a concave mirror. If the image is 4.0 cm ta( i2 y6daxwpj5ll, how far is ix6j2(i d pw5yat from the mirror?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal length 20 cm 4yx;clkhf 0p6. The object is 4.0 cm tall. Where is the imagelh4 c fp60kx;y located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 4zvewh3) 6aor s,jg;:ie; h8yl0 cm in front of a cosmetic mirror (concave mirror), the erect image is ,r ; :si l8awyh3)gvj6;zheoe twice the size of the object. What is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in frontb, gac cuo.c.65sob l: of a concave shaving mirror. If the image is an erect image 1.5 times as lac6uoa gosc.b, l.b 5:crge as the object, what is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave mirror with r., 1egm qclxc8 36jeyfocal length 5.0 cm. Where is the objgx c6r 3l,1e qe.ycjm8ect?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror hafcxk. .7;5v1 3xrta g4cpvlxh s a focal length of -20 cm. An object is placed 10 cm in front of the mirror on th..gt p a1kxx3vr lc4h5c;x7vfe mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of -20 cm. An object ijk 2pk.6f9 ajgs placed 30 cm in front of the mirror on the mirror's axis. Where is the image locat9.aj62kkj fpged?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in fro+j9f i1ss) 8fabsd n6td7t+xnv7dqe8( jhc; dnt of a convex mirror. The image is 5.8 cm behind the mdx6jesd;i977s 1 hdctnv+n ) a+q(tfb j sf8d8irror. What is the focal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. T8b*ag rg*m ks0he image is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mirror's focal length0ks*r gbm*8ag?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of 1.50, what is; wok7-zug*je c*pi ;x the speed of light througwc*ugo -jzkx;7*i; eph it?

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incidentq2cd/ a1tvq8 *6g onyb on an air to glass interface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air at an al;tkjtop i0. 0ngle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming ray is at an 6rsvp3b k:10 c t+7luplt hrw-angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is sxz7 ayli,2 r8kgx60icggab ,;pread smoothly and evenly over the surface of water on a windless day. 0y2 g7gg,;8lxbx a r,kz aic6iWhat is the angle of refraction in the water for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a still pon;dclx. m az9g mrg l(1ap16hca/w()xed of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refraction for watgld(aar)1 c6( xpwazl1m hm e/;cg9 .xer is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling inf/)9 mq ssgyo1dd 02dq8gi.ky air, strikes a plate of transparent material at an angle o. ygk8m9) 0 i1yd/ds qqf2gsdof incidence of $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in air is in/qrh0x t0ydil. .nx q5cident on a slab of transparent material. The incident beam and the refracted beamx 0.ihr5t q y/dlx.0nq make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index of refraction of 1.46. Light scfrb /mdn*e8l;- ella9bk0k n )kc61 is passing through it at -d1bcf/8mn)r a 0*;9lclebnklkk6es$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for light o-0 g2zxnt5-zy;tb h htraveling from crown glass (n = 1.52) into water (n = y52 hb t nto;zh-gzx0-1.33)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refrac/t:vl6+d4* as 8aejw0mk tlxction of 1.50. What is its critical angle of incidence?jx 08+c* wl4mea6l avstkd:t/

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clhuz1fa*92+ n6wjkt ltear plastic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guide"?jhaz 6 tn2uk+ w9fl1t*

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is measure/a sbc 3m.9tcrd at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substa*s/.r uz1h y hy57rqrunce from air at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 mete:zdwx:nw,ea)j z d bq ;r cg)gcinn9j (g-q(2.r long and has a diameter of 20 mm. Its ends are perpzc dna2nz)(( qb,;)9r.-qg:wwg e cx:dij gnjendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focal lenggkgna+ kr0a*2wq23x kth converging lens. How far3x2 *awn 2g+kk qg0akr is the image of this object from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens w+e+se,ck fe7uith focal length 4 cm. Where is the sekfc+7,e e+uimage?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converging lens, an vccat4sux(t(jn0vs*a 6nn i92qns3v+s- i. p d the image is 4.0 mm behind the lens. What is thsn04v-(qcc (t3n pv .2aasnuv tss9jix*+in6 e focal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a converging lens. If the imageqklb-kn:g 6:b .ixb , z;ajwcobf h-oyu5 01s5 is 4.0 mm tahb, . 6l05c5-o1jg ;xfzk ikq-s:y n boba:ubwll, how far is it from the lens?

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the inverted image bh5)r+p j00j8ki.0ddb- y xszn6wj hi is half the size of the object. What is the fow0.jjb s h)80rp+ni5xkdj0iy zh6- dbcal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focaed(ijuy1u/kn:d 6gq 2l length 5.0 mm. Wher:nu61kq( y2eg jid /due is the object?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm from a convd*b,dv +l9qa aerging lens. The image is virtual and 6.2 cm tall. Wh,va*a+dqd l 9bat is the focal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a cqc3* 4g(+0 4 zgrcbhivl i/-wyh.pg lyonverging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is the og* c -gwi43vy 0hqhbz4g(l.py+ic r/ lbject?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a converging lens, it forms a real ;m*/hog cks,ximage. When the object i hk;o,gxcm s*/s moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 cm from a thin convex lens. Thbnt/ 7b bv6phk7qp:+ z /uejm(e lens has a focal length of 10 cm. What are the v 7+b(j/6 7tkv m/peub bqhznp:alues, respectively, of the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverfg4qph :+1 kzvging lens with a focal length of 10 cm. What is the image distanz4 1pkvqfh+ :gce?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diw. t*zcnv xs93xmd1:1(c cwz uverging lens with a focal length of 10 cm. What is the mxw 9c wzmnxd:zc.3*(u s1vt 1cagnification?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front of agep)j*yt dx;dm y,2 y- diverging lens. The image is 4.0 cm from the lens. How tall ie-mpyjy dxdg ;y*,)2 ts the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in front of aw c3s, n74.l fbvo,rlz diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length o3vc lbo7sn,4z.lfwr, f the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 40 cm from a thin lens. If (l cgznli5q, g(nex ,/a virtual image forms at a distance of 50 cm frome/zlgqi l (,gnc(xn5 , the lens, on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must the object fur3 p*c, nyapm 8082 oea4fg-nukk,pbe placed if it is to form a virtual image ma m4couak y-,ar*p2gekn88 f03n f,pupgnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal length lens, such as is used in many 35-mm cameras, vw4jrc2 gps 8)must an ob82sj) w4 rvpcgject be positioned if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm,m5 ysnx6-k .blne(jxh.y-+ga4 cfz5jvy , aw : are placed in contact. What is the focal length of thism.5jew4sb (-,hnzg:.6 va-yjx ln 5fyx c +ayk compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-conve0t 6pjdl6ds 55/gdrxbx) thin lens has radii of curvature 46 cm, and is made 6xs 5jdrl pb6dgd/t50of glass of index of refraction n = 1.60. What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens maa(ptrlk 62li86q v()gdy )l fwt3bvi 2de of glass (n = 1.50) has a radius of 40 cm on the front side and 30 c)wldyla tiv (8t23lr(6b qkpg2if 6v)m on the back side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). The ratbtl6: z -0i2jq+*ugr.,kcy giw xs/pdius of the front surface is 20 cm and tc q- gy.zb6r,*p2x0l: js/+igtui w tkhe radius of the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens itptx5w pq:(b8wl1 ygb0)o5u es to have a focal length of 40 cm. It is made of glass of index of p18 5 ttqwybp5o ulwxb:g e(0)refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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