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Q.

A thin mica sheet of thickness 2×10−6m and refractive index (μ=1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift

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a

2 fringes upward

b

2 fringes downward

c

10 fringes upward

d

None of these

answer is A.

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Detailed Solution

Shift =βλ(μ−1)t=β5000×10−10×(1.5)×2×10−6=2β,i. e., 2 fringes upwards.

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A thin mica sheet of thickness 2×10−6m and refractive index (μ=1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift