Question

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. 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.

• 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 1

Answer: (D)

There would be a regular two slit pattern on the second screen

Answer 2

:

In given figure there is a hole at minima point $P_{2}$the hole will act as a source of fresh light for the slits $S_{3}$and $S_{4}$. Hence there will be a regular two slit pattern on the second screen