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Q.

In Young's double slit experiment, the separation between two coherent sources S1 and S2 is d and the distance between the source and screen is D. In the interference pattern, it is found that exactly in front of one slit, there occurs a minimum. Then the possible wavelengths used
in experiment are

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a

λ=d2D,d22D,d23D

b

λ=d2D,d23D,d25D

c

λ=d2D,d25D,d29D

d

λ=d23D,d27D,d211D

answer is A.

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Detailed Solution

y=d2=2(n1)2d

λ=d2D(2n1); n=1,2,3

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