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An object O is kept in air in front of a...

An object O is kept in air in front of a thin plano-convex lens of radius of curvature `10 cm.` Its refractive index at `3//2` and the medium towards right of the plane surface is water of refractive index `4//3.` What should be distance x of the object so that the rays becomes parallel finally?

A

5 cm

B

10 cm

C

20 cm

D

None of these

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