Figure shows standard two slits arrangement $S_1, S_2, P_1$ and $P_2$ are two maxima points on either side of P. At point $P_2$ on the screen there is a hole behind $P_2$ two slits arrangement with slits $S_3$ and $S_4$ and pattern obtained on second screen, which of the following is correct:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Regular two slits pattern on the second screen
When light passes from $P_2$ after constructive interference, from slits $S_1$ and $S_2$, it behaves as a source for another two slit-interference pattern.
Thus, on the second screen, a regular two-slit interference pattern will form due to coherent passing through $S_3$ and $S_4$.