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A plano- convex lens of focal length 40c...

A plano- convex lens of focal length 40cm and refractive index = 1.5 is silvered at the curved surface. It will behave in air as a

(A) concave mirror of focal length = 20cm

(B) concave mirror of focal length `20/3` cm

(C) convex mirror of focal length= `20/3` cm

(D) convex mirror of focal length `10/3` cm

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