Figure shows a standard two slit arrangement with slits `S_(1), S_(2). P_(1), P_(2)` are the two minima points on either side of P (Figure). At `P_(2)` on the screen, there is a hole and behind `P_(2)` is a second 2-slit arrangement with slits `S_(3), S_(4)` and a second screen behind them.

Options

A. there would be no interference pattern on the second screen but it would be lighted
B. the second screen would be totally dark
C. there would be a single bright point on the second screen
D. there would be a regular two slit pattern on the second screen

Answer

D

Explanation

Refer to the figure given in the question. The slits `S_(1)` and `S_(2)` will act as coherent sources and produce interference pattern on the screen. This happens in the usual experiment. But is this case, there is a hole at `P_(2)`. `P_(2)` acts as a source of light for the slits `S_(3) and S_(4)`. Light passing through `S_(3) and S_(4)` will produce a regular two slit pattern on the second screen.