[问答题]
Suppose a thin piece of glass is placed in frofg*s7b gw 7x w6*lm8esnt of the lower slwee fil x3.n:v8rfo:2jez50 v it in Fig. 24–7 so that the two waves ente lrwz.o2::80ifxfj3 ven5veer the slits 180$^{\circ}\,$ out of phase (Fig. 24–57). Describe in detail the interference pattern on the screen.
24-7
24-57