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MHT CET 2025 (21 Apr, Shift 1) · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from MHT CET 2025 (21 Apr, Shift 1)

Q29MHT CET 2025 · 21 APR · SHIFT 1Medium

YDSE: Film, Medium & Two Wavelengths

In Young's double slit experiment, in an interference pattern, a minimum is observed exactly in front of one slit. The distance between the two coherent sources is d and $D$ is the distance between source and screen. The possible wavelengths used are proportional to

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Answer: (b)

Path difference in front of a slit $= \dfrac{d^2}{2D} = \dfrac{(2n-1)\lambda}{2}$ .
$\lambda = \dfrac{d^2}{(2n-1)D} \propto \dfrac{1}{D}, \dfrac{1}{3D}, \dfrac{1}{5D}, \ldots$
So the answer is (b).

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