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A lens is made of flint glass (refractiv...

A lens is made of flint glass (refractive index `=1.5`). When the lens is immersed in a liquid of refractive index `1.25` , the focal length:

A

Increases by a factor of 1.25

B

Increases by a factor of 2.5

C

Increases by a f actor of 1.2

D

Decreases by a factor of 1.2

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The correct Answer is:
B
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