The focal length of a convex lens for red and violet colours is 26 cm and 25 cm respectively. Find the longitudinal (axial) chromatic aberration produced by the lens.

The focal length of a coverging lens is measured for violet,green and red colours.It is f_v,f_g and f_r respectively.We will get

What happens to be focal length of convex lens when it is immersed in water?

If f_v and f_r are the focal lengths of a convex lens fro violet and red light respectively and F_v and F_r are the respective focal length of a concave lens,then we must have

What is the focal length of a double convex lens for which radius of curvature of the surfaces is 40 cm and refractive index of the glass is 1.5?

What changes in the focal length of a convex lens occur,when the incident violet light on them is replaced by red light?

If the focal length of a converging lens is 50 cm. What is the power of the Lens ?

The focal length of a convex lens is 30 cm and the size of image is quarter of the object.Them,the object distance is

The focal length of a concavo - convex lens of radii of curvature 5 cm and 10 cm is 20 cm.What will be its focal length in water (mu=4//3) ?

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.

A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.