Q.

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  μ1 and that of 2 is μ2 , then the focal length of the combination is

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a

R2(μ1μ2)

b

2Rμ1μ2

c

Rμ1μ2

d

R2(μ1μ2)

answer is A.

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