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Question

In a single slit diffraction of light of wavelength λ by a slit of width e, the size of the central maximum on a screen at a distance b is :

A
2bλ+e
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B
2bλe
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C
2bλe+e
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D
2bλee
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Solution

The correct option is C 2bλe+e
Direction in which the first minima occurs is θ.
esinθ=λ
eθ=λ
θ=λe (sinθ=θ, for small θ)
Width of central maximum=2bθ+e=2bλe+e.

1444405_1156239_ans_99064f3f4ed14288823583b12a2771d9.png

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