Question

A conversing lens has a focal length of in air. It is made of a material of refractive index . If it is immersed in a liquid of refractive index , find the new focal length. 

Hard
Updated on : 2022-09-05
Solution
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Correct option is A)

Converging lens of focal length = in air

= Lens formula

Where refractive index of lens

             refractive index of medium

In air





In liquid



Hence,

new focal length is cm

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