When plane surface of planoconvex lens is silvered focal legth is28cm?
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A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28cm. when its curved surface is silvered and the plane surface not silvered,it is equivalent to a concave mirror of focal length 10cm,then the refractive index of the material of the lens is.
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A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28cm. when its curved surface is silvered and the plane surface not silvered,it is equivalent to a concave mirror of focal length 10cm,then the refractive index of the material of the lens is.
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