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Questions  

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
b
2bλe
c
2bλe+e
d
2bλe-e

detailed solution

Correct option is C

The direction in which the first minima occurs is θ (say). Then esinθ=λ or eθ=λ or, θ=λe(∵   θ=sinθ  when θ small) Width of the central maximum =2bθ+e=2b.λe+e

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