A plano-convex lens of focal length \( 20 \mathrm{~cm} \) has its plane side silvered : (a) The ...

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A plano-convex lens of focal length \( 20 \mathrm{~cm} \) has its plane side silvered :
(a) The radius of curvature of the curved surface of planoconvex lens is equal to half of radius of curvature of a surface of equi-convex lens of focal length \( 20 \mathrm{~cm} \)
(b) A object placed at \( 15 \mathrm{~cm} \) on the axis on the convex side of silvered plano-convex lens gives rise to an image at a distance of \( 30 \mathrm{~cm} \) from it
(c) An object placed at a distance of \( 20 \mathrm{~cm} \) on the axis on the convex side of silvered plano-convex lens gives rise to an image at \( 40 \mathrm{~cm} \) from it
(d) Silvered plano-convex lens acts as a concave mirror of focal length \( 10 \mathrm{~cm} \)
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