A biconvex lens with equal radii curvature has refractive index 1.6 and focal length 10 cm. Its radius of curvature will be:

A converging lens of refractive index 1.5 and of focal length 15 cm in air, has the same radii of curvature for both sides. If it is immersed in a liquid of refractive index 1.7 , find the focal length of the lens in the liquid.

A biconvex lens (mu=1.5) has radius of curvature 20cm (both). find its focal length.

A biconvex lens (mu=1.5) has radius of curvature 20cm (both). find its focal length.

A biconvex lens is to be made form glass of refractive index 1.55, which both faces having same radius of curvature. Determine this radius of curvature if the focal length is 20 cm.

If in a planoconvex lens, the radius of curvature of the convex surface is 10cm and the focal length is 30 cm , the refractive index of the material of the lens will be