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When entire Young's double slit apparatu...

When entire Young's double slit apparatus is immersed in a liquid the fringe width decreases by `20^(@)`. The refractive index of the liquid is

A

`1.5`

B

`1.25`

C

`0.8`

D

`1.33`

Text Solution

Verified by Experts

`(W)=(lambda)/(mu)(D)/(d)`, `W_(0)=(lambdaD)/(d)`
`rArr (W)/(W_(0))=(4)/(5)=(1)/(mu)rArrmu=1.25`
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