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Physics Question on Images Formed By Lenses

A plano-convex lens fits exactly into a plano- concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices, μ1μ_1 and μ2μ_2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

A

R2(μ1+μ2)\frac{R}{2(μ_1 +μ_2)}

B

R2(μ1−μ2)\frac{R}{2(μ_1 - μ_2)}

C

R(μ1−μ2)\frac{R}{(μ_1 - μ_2)}

D

2R(μ2−μ1)\frac{2R}{(μ_2 - μ_1)}

Answer

R(μ1−μ2)\frac{R}{(μ_1 - μ_2)}

Explanation

Solution

The correct option is (C): R(μ1−μ2)\frac{R}{(μ_1 - μ_2)}