[问答题]
Suppose a thin piece of glass is pllx qk(hh j2n 3)q7qz,pacedw4hh 35fc x;sl in front of the lower slit in Fig. 24–7 so that the two waves enter the slits 18;hc54s 3lwxhf0$^{\circ}\,$ out of phase (Fig. 24–57). Describe in detail the interference pattern on the screen.
24-7
24-57