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A convex lens of glass (mu(g)=1.45) has ...

A convex lens of glass `(mu_(g)=1.45)` has focal length `f_(g)` is air. The lens is immersed in a liquid of refractive index `(mu_(g))` 1.3. The ratio of the `f_(liquid)//f_(g)` is

A

3.9

B

0.23

C

0.43

D

0.39

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