[问答题]
White light strikes (a) a diffraction grating, and (b) 1sn+ df5v5z 0zvo3ubta prism. A rainbowjp a;ahk8z: j;;zphg9:mawf*mnn6 *z appears on a wall just below the direction of the horizontal incident beam in each case. 98::m;p6pa ;fw ha;kng *jzmajzhn*zWhat is the color of the top of the rainbow in each case? Explain.
