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Question

The fringe width β of the fringes produced in Young's double slit experiment conducted for monochromatic light of wavelength λ with slit difference d and separation between slits and screen D is :

A
β=λDd
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B
β=Ddλ
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C
β=λdD
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D
β=λd2D2
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Solution

The correct option is A β=λDd
From path difference
Δx=PS2PS1PS2PA
=S2A=dsinθ
dtanθ=dyD

fringe width β=Dλd

53096_4494_ans_0099e48767e74541927e85fc720ed5b6.png

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