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Q.

In Young’s double slit experiment, in an interference pattern second minimum is observed exactly in front of one slit. The distance between the slits is d and the distance between source and screen is D. The wavelength of light source used is

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a

d22D

b

d24D

c

d23D

d

d2D

answer is C.

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Detailed Solution

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yD=Δxd

d/2D=Δxd

d22D=2n−1λ2λ=d22n−1Dn=2∴λ=d23D

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