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48. A planoconvex lens is silvered on its plane side and it acts as a concave mirror of focal length 20 cm.When the convex side is silvered it acts as a concave mirror of focal length 7 cm.Calculate the refractive index of the lens material.

Answer» 48. A planoconvex lens is silvered on its plane side and it acts as a concave mirror of focal length 20 cm.When the convex side is silvered it acts as a concave mirror of focal length 7 cm.Calculate the refractive index of the lens material.


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