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A lens of refractive index n is put in a...

A lens of refractive index n is put in a liquid of refractive index `n'`. If focal length of lens in air is `f`, its focal length in liquid will be.

A

`- (fn'(n-1))/(n'-n)`

B

`-(f(n'-n))/(n'(n-1))`

C

`-(n'(n-1))/(f(n'-n))`

D

`(fn' n)/(n-n')`

Text Solution

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The correct Answer is:
a
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