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A thin mica sheet of thickness 2xx10^-6m...

A thin mica sheet of thickness `2xx10^-6m` and refractive index `(mu=1.5)` is introduced in the path of the first wave. The wavelength of the wave used is `5000Å`. The central bright maximum will shift

A

2 fringes upward

B

2 fringes downward

C

10 fringes upward

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Shift `=beta/lambda(mu-1)t`
`=(beta)/((5000xx10^(-10)))xx(1.5)xx2xx10^-6=2beta`,
i.e., 2 fringes upwards.
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