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

A Plano-convex lens fits exactly into a plano-concave lens. Three plane surfaces are parallel to each other. If lenses are made of different material of refraction indexes and R is the radius of curvature of the curved surface of the lenses ,then the focal length of the combination

A

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

B

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

C

`R/(mu_1-mu_2)`

D

`2R/(mu_2-mu_1)`

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