Figure shows a standard two-slit arrangement with slits S₁, S₂. P₁, P₂ are the two minima points on either side of P shows in Figure. At P₂ on the screen, there is a hole and behind P₂ is a second screen, slit arrangement with slits S₃ and S₄ and a second screen behind them.

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There would be a single bright point on the second screen.

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

There would be no interference pattern on the second screen but it would be lighted.

The second screen would be totally dark.

answer is D.

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Detailed Solution

At P₂is minima due to two wave fronts in opposite phase coming from, two slits S₁ and S₂ but there is wave fronts from S₁,S₂. So P₂ will act as a source of secondary
wavelets. Wave front starting from P₂ reaches at S₃ and S₄ slits which will again act as two monochromatic or coherent sources and will form pattern on second screen.

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