A thin plano-convex lens acts like a concave mirror of radius of curvature `20 cm` when its plane surface is silvered. The radius of curvature of the curved surface if index of refraction of its matarial is `1.5` will be

A thin plano-convex lens acts like a concave mirror of focal length 0.2m when silvered from its plane surface.The refractive index of the material of the lens is 1.5 .The radius of curvature of the convex surface of the lens will be: 0.1m

A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be

A thin plano - convex lens acts like a concave mirror of focal length 0.2 m, when silvered on its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens will be

The radius of curvature of each surface of a convex lens of refractive index 1.5 is 40 cm. Calculate its power.