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Convex lens made up of glass (mu(g)=1.5)...

Convex lens made up of glass `(mu_(g)=1.5)` and radius of curvature R is dipped into water. Its focal length will be (Refractice index of water =4/3)

A

4R

B

2R

C

R

D

`(R)/(2)`

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The correct Answer is:
A
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