A plano-convex lens (focal length f_2, refractive index \mu_2, radius of curvature R) fits exactly into a plano-concave lens (focal length f_1, refractive index \mu_1, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal lengthof the combination will be : [12 Jan 2019 Shift 2]

JEE Main 12 Jan 2019 Shift 2 Solved Paper

Section: Physics

Question : 18 of 90

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A plano-convex lens (focal length f2, refractive index µ2, radius of curvature R) fits exactly into a plano-concave lens (focal length f1, refractive index µ1, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal lengthof the combination will be :

[12 Jan 2019 Shift 2]

f1−f2
f1+f2
R
µ2−µ1
2f1f2
f1+f2

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