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