What causes chromatic aberration?
A biconvex lens in air has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1.5, what is its focal length?
Radii of curvature of a converging lens are in the ratio 1:2. Its focal length is 6cm and refractive index is 1.5. Then its radii of curvature are _________ respectively.
The focal length of a biconvex lens is 20 cm and its refractive index is 1.5. If the radii of curvatures of two surfaces of lens are in the ratio 1 : 2, then the larger radius of curvature is :
A thin concavo-convex lens has two surfaces of radii of curvature R and 2R. The material of lens has a refractive index μ. When kept in air the focal length of lens
If radii of curvature of both convex surfaces is 20 cm, then focal length of the lens for an object placed in air in the given arrangement is