4 1 6 133 The focal length of a biconvex lens is 20 cm Duand...
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4 1 6 133 The focal length of a biconvex lens is 20 cm Duand its refractive index is 1 5 If the radii of ubt curvatures of two surfaces of lens are in the ratio 1 2 then the larger radius of curvature is in cm 1 10 2 15 3 20 4 30
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