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>> $A plano convex lens fits exactly into a$

Question

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 $μ_{1}$ and $μ_{2}$ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is :

A

$\frac{R}{2 ( μ _{1} + μ _{2} )}$

B

$\frac{R}{2 ( μ _{1} - μ _{2} )}$

C

$\frac{R}{( μ _{1} - μ _{2} )}$

D

$\frac{2 R}{( μ _{2} - μ _{1} )}$

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Updated on : 2022-09-05

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Correct option is C)

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