Ray Optics Test...

Figure given below shows a beam of light converging at point P. When a concave lens of focal length 16 cm is introduced in the path of the beam at a place O shown by dotted line such that OP becomes the axis of the lens, the beam converges at a distance x from the lens. The value x will be equal to

When light rays from the sun fall on a convex lens alonga direction parallel to its axis

A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are

The dispersive power of the material of lens of focallength 20 cm is 0.08. The longitudinal chromatic aberration of the lens is

A convex lens is dipped in a liquid whose refractiveindex is equal to the refractive index of the lens. Then its focal length will

The sun makes 0.5° angle on earth surface. Its image ismade by convex lens of 50 cm focal length. The diameter of the image will be

The chromatic aberration in lenses becomes due to

If aperture of lens is halved then image will be

When the convergent nature of a convex lens will beless as compared with air

An achromatic combination of lenses produces