In a Young's double-slit experment, the fringe width is `beta`. If the entire arrangement is now placed inside a liquid of refractive index `mu`, the fringe width will become

Options

A. `(beta)/(n+1)`
B. `nbeta`
C. `(beta)/(n)`
D. `(beta)/(n-1)`

Answer

C

Explanation

`beta = (lambdaD)/(d)` as `beta prop lambda` and `lambda prop (1)/(n)`
`beta.` .(in medium) `= (beta)/(n)`