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Q.

If a thin mica sheet of thickness t refractive index μ(=5/3) is placed in the path of one the interfering beam as shown in fig (1), then the displacement of the fringe system is

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a

Dt3d

b

Dt5d

c

Dt4d

d

2Dt5d

answer is A.

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Detailed Solution

S=(μ−1)t(D/2d) =(5/3−1)t(D/2d)=Dt3d
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