[填空题]
Let’s examine spherical w1f g kx is6y1g (pyy7824unviaberration in a particularq lc,1ykoy -56wohwz( situation. A planoconvex lens of index of refraction 1.501 h6 w(z5-ylck, ooqyw and radius of curvature $R=12.0\mathrm{~$cm$}$ is shown in (Fig. Below). Consider an incoming ray parallel to the principal axis and a height h above it as shown. Determine the distance d, from the flat face of the lens, to where this ray crosses the principal axis if
(a) $h=1.0\mathrm{~$cm$},$ $d_1$ = cm
(b) $h=6.0\mathrm{~$cm$},$ $d_2$ = cm
(c) How far apart are these “focal points”? $\Delta d$ = cm
(d) What is the radius of the “circle of least confusion” produced by the $h=6.0-\mathrm{~$cm$},$ ray at the “focal point” for $h=1.0\mathrm{~$cm$},$? r = cm
