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A plano-convex lens (focal length f_2, refractive indexmu_(2), radius of curvature R) fits exactly into a plano-concave lens (focal lengthf_(1) refractive index mu_1, radius of curvature R). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be : |
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Answer» `f_(1)-f_(2)` |
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