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One plano-convex and one plano-concave l...

One plano-convex and one plano-concave lens of same radius of curvature 'R' but of different materials are joined side by side as shown in the figure.If the refractive index of the material of 1 is `mu_1` and that of 2 is `mu_2`, then the focal length of the combination is :

A

`(R )/(2-(mu_(1)-mu_(2)))`

B

`(R )/(2(mu_(1)-mu_(2)))`

C

`(2R )/(mu_(1)-mu_(2))`

D

`(R )/(mu_(1)-mu_(2))`

Text Solution

Verified by Experts

The correct Answer is:
D
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