Question

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

A
2RM2M1
B
R2(M2+M2)
C
R2(M1M2)
D
R(M1M2)1
Solution
Verified by Toppr

1F=(μ1,1)(1R)1F(μ21)(1R)1re=μ1R+1R+μ2R1R1FC=μ2μ1RF=Rμ2μ1
Hence option (D) is correct

2000985_1231822_ans_726cb79ce4f4470ab801896fc965b71a.PNG

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