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Question

In Young’s double slit experiment the two slits are d distance apart. Interference pattern is observed on a screen at a distance D from the slits. A dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of the light is

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Solution

The correct option is **D** d2D

(n−12)Dλd=d2

λ=d2(2n−1)D

λ=d2D for n=1.

(n−12)Dλd=d2

λ=d2(2n−1)D

λ=d2D for n=1.

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