The plane face of a planoconvex lens is silvered. The refractive index of material and radius of curvature of the curved surface of the lens are n and Rrespectively. This lens will behave as a concave mirror of focal length
(A) R/n
(B) R/(n-1)
(C) nR
(D) R/2(n-1)
Correct Answer : Option (D) R/2(n-1)
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