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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

two fringes upward

B

two fringes downward

C

ten fringes upward

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
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(2xx10^(-6))=2beta`
So, central bright maxima will shift two fringes upward.
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