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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

`15 cm`

Text Solution

Verified by Experts

The correct Answer is:
C
From the first refraction, rays should become
parallel. Or, image should formed at infinity.
Applying
`(mu_2)/u-(mu_1)/u=(mu_2-mu_1)/R`
`(3//2)/oo-1.0/(-x)=(3//2-1.0)/(+10)`
Solving, we get `x=20 cm`
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