A plano-convex lens has curved surface having radius of curvature 60 cm and it is made of material of refractive index 1.5. When the convex surface is silvered, the system will work as a concave mirror of focal length(a) 20 cm(b) 24 cm(c) 30 cm(d) 15 cm
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(c) 30cm focal length is half of radius of curvature
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