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Question

A mica slit of thickness t and refractive index μ is introduced in the ray from the first source S1. By how much distance the fringe pattern will be displaced ?

A
dD(μ1)t
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B
Dd(μ1)t
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C
d(μ1)D
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D
Dd(μ1)
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Solution

The correct option is D Dd(μ1)t
Path difference introduced due to insertion of mica slit = t(μ1)

Distance of fringe from mean position is given as
β=Dyd

Thus Δβ=DΔyd

=D×t(μ1)d

=Dd(μ1)t


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