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Kalpana Arjun Dhawan
Asked: 2022-11-07T21:33:47+05:30 In:

A thin mica sheet of thickness `4xx10^(-6)` m and refractive index `(mu=1.5)` is introduced in the path of the light from upper slit. The wavelength of the wave used is `5000 Å` The central bright maximum will shift
A. 4 fringes upward
B. 2 fringes downward
C. 10 fringes upward
D. None of these

A thin mica sheet of thickness `4xx10^(-6)` m and refractive index `(mu=1.5)` is introduced in the path of the light from upper slit. The wavelength of the wave used is `5000 Å` The central bright maximum will shift
A. 4 fringes upward
B. 2 fringes downward
C. 10 fringes upward
D. None of these
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1 Answer

  1. Correct Answer – A
    On introducing mica sheet, fringe shift `=beta/lambda(mu-1)t`
    where, t is thickness of sheet
    So, shift `beta/((5000xx10^(-10)))xx(1.5-1)xx(4xx10^(-6))=4beta`
    So, central bright maximum will shift 4 fringes upward

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