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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

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The correct Answer is:
A
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