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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/(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

Verified by Experts

The correct Answer is:
A
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