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# 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 μ1and μ2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is :R2(μ1+μ2)R2(μ1−μ2)R(μ1−μ2)2R(μ2−μ1)

A
R2(μ1+μ2)
B
2R(μ2μ1)
C
R2(μ1μ2)
D
R(μ1μ2)
Solution
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