The radius of curvature of each surface of a bi-convex lens made of glass of refracive index 1.5 is 25 cm. Calculate focal length of the lens.

The radius of curvature of each face of a biconcave lens made of glass of refractive index 1.5 is 30 cm. Calculate the focal length of the lens is air.

The radius of curvture of the convex face of a plano-covex lens is 12 cm and its refractive index is 1.5. Find the focal length of the lens. .

The radii of curvature of double convex lens are 30 cm and 60 cm and its refractive index is 1.5 .Calculate its focal length.

The radius of curvature of eithr face of a conex lens is equal to ts focal length .What is the refractive index of its material?

The radius of curvture of the convex face of a plano-covex lens is 12 cm and its refractive index is 1.5. Calculate the image distance,when a point object is paced on the axis 20 cm from the lens.

The radii of curvature of the faces of a double convex lens are 10 cm and 12 cm respectively.If the focal length of the lens is 12 cm ,find the refractive index of the material of the lens.

The radii of curvature of the two faces of a convex lens are 0.1 m and 0.15 m respectively.If the foal length of the lens is 0.12 m,find the refractie index of the material of the lens.

Find the radius of curvature of the convex surface of a plano convex lens,whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5/

A plano-convex lens is made of a material of refrative index mu=1.5 .The radius of curvature of curved surface of the lens is 20 cm.If its plane surface is silvered,the focal length of the silvered lens will be

A binoconves lens with both faces of the same radius of curvature is to be manufatured from a glass of refractive index 1.55.What should be the radius of curvature for the focal length of the lens to be 20 cm?