The 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 \(P\) as shown in the figure.

                                         
At \(P_2\) on the screen, there is a hole and behind \(P_2\) is a second \(2\text-\)slit arrangement with slits \(S_3, S_4\) and a second screen behind them. 

1. There would be no interference pattern on the second screen but it would be lighted.
2. The second screen would be totally dark.
3. There would be a single bright point on the second screen.
4. There would be a regular two-slit pattern on the second screen.
(d) Hint: The interference occurs when the sources are coherent sources.
According to the question, there is a hole at point P2. From Huygen’s principle, the wave will propagate from the sources S1 and S2. Each point on the screen will act as secondary sources of wavelets. Now, there is a hole at point P2 (minima). The hole will act as a source of fresh light for the slits, S3 and S4.Therefore, there will be a regular two-slit pattern on the second screen.