Question

The focal length of a lens of refractive index is . If the lens is immersed in a liquid of refractive index then the focal length of lens is 

A

B

C

D

Easy
Solution
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Correct option is C)

 
where, is refractive index of lens material with respect to its surrounding medium
If lens is immersed in the liquid of refractive index equal to its own then  and hence above equation becomes:
 

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