[" The radius of curvature of spherical surfaces of a convex lens are "15cm" .and "10cm" ."],[" respectively.If Refractive Index of lens is "1.5" ,then find its focal length."]

If the radii of curvature of the two surfaces of a concave lens are 10 cm and 20 cm respectively and the refractive index is 1.5. What is its focal length ?

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

The radius of curvature of convex surface of piano convex lens is 10 cm and its focal length is 30 cm, then the refractive index of the material of the lens is

The radii of curvature of both the sides of a convex lens are 15 cm and if the refractive index of the material of the lens is 1.5, then focal length of lens in air is ......... cm.

The radius of curvature of the convex face of a plano convex lens is 12cm and the refractive index of the material of the lends 1.5. Then, the focal length of the lens is

The radius of curvature of the convex face of a plano convex lens is 12cm and the refractive index of the material of the lends 1.5. Then, the focal length of the lens is

The radius of curvature of the curved surface of a plano-convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will

The radius of curvature of the curved surface of a plano-convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will