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JEE Main 10 Apr 2019 Paper 1 Solved Paper

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Question : 4

Total: 90

One Plano-convex and one plane of-concave lens of same radius of Curvature ‘R’ but of different materials are joined side by side as shown in the figure . If refractive index of the material of 1 is µ1 and that of 2 is µ2 ,then the focal length of the combination is

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

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