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If in a plano-convex lens, the radius of...

If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive index of the material of lens will be

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If in a plano-convex lens, the radius curvature of the convex surface is 10 cm and the focal length of the lens is 20 cm , then the refractive index of the material of lens will be

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