A piano convex lens fits exactly into a piano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices \mu_1 and \mu_2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is (2013 NEET)

Correct Answer is : R(µ1−µ2)

Class 12 NEET Physics Optics Questions Part 1

Question : 22 of 100

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A piano convex lens fits exactly into a piano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices µ1 and µ2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

(2013 NEET)

R
(µ1−µ2)
2R
(µ2−µ1)
R
2(µ1+µ2)
R
2(µ1−µ2)

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