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A plano- convex lens fits exactly into a...

A plano- convex lens fits exactly into a plano- concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices `mu_(1)` and `mu_(2)` and R is the radius of curvature of the curved curface of the lenses, then the focal length of the combination is

A

`(R )/(mu_1 - mu_2)`

B

`(2R)/(mu_1 - mu_2)`

C

`(R )/(2(mu_1 - mu_2))`

D

`( R)/(mu_1 + mu_2)`

Text Solution

Verified by Experts

The correct Answer is:
A
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