A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices `mu_(1)` and `mu_(2)` and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination isA. `(R)/(2(mu_(1)+2mu_(2)))`B. `(B)/(2(mu_(1)-2mu_(2)))`C. `(R)/(2(mu_(2)-2mu_(1)))`D. `(2R)/(2(mu_(2)-2mu_(1)))`

A plano-convex lens fits exactly into a plano-concave lens. Their plan

1.	A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices `mu_(1)` and `mu_(2)` and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination isA. `(R)/(2(mu_(1)+2mu_(2)))`B. `(B)/(2(mu_(1)-2mu_(2)))`C. `(R)/(2(mu_(2)-2mu_(1)))`D. `(2R)/(2(mu_(2)-2mu_(1)))`
Answer» Correct Answer - C

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