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When a convex lens of refactive index 3/...

When a convex lens of refactive index `3//2` and focal length `20 cm` is dropped into water of refracticve index `4//3`. Its focal length in water is

A

`20`

B

`40cm`

C

`80cm`

D

`10cm`

Text Solution

Verified by Experts

The correct Answer is:
C
`(f_(liq))/(f_(air))=((mu_(g)-1)mu_(l))/((mu_(g)-mu_(l))`
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