Optics Question 167

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

Options:

A) 2bλ+e

B) 2bλe

C) 2bλe+e

D) 2bλee

Show Answer

Answer:

Correct Answer: C

Solution:

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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