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Cutting of Thin Lenses

A convergent ...

Question

A convergent lens made of crown glass (refractive index 1.5) has focal length 20cm in air. If it is immersed in a liquid of refractive index 1.60, its focal length will be:

A

160cm

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B

-80cm

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C

-160cm

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D

100cm

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Solution

The correct option is C
-160cm

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