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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:
C
Shift/(Fringe width)`=y_(0)/beta=((mu-1)tD/d)/((Dlambda)/d)=((mu-1)t)/lambda`
`=((1.5-1)xx2xx10^(-6))/(5xx10^(-7))=10`
`10` fringes upward.
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