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

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 meterial 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

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The correct Answer is:

D

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