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

Text Solution

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The correct Answer is:
A
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