The radii of curvature of the two surfaces of a lens are 20 cm and 30 cm and the refractive index of the
material of the lens is 1.5. If the lens is concavo convex then the focal length of the lens is.. please need it urgently
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The compound interest on 1000 for 1 whole and ½ years at 8% p.a. compounded half yearly is 125 Rs.
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