Question

An equiconvex lens forms a two times enlarged real image when an object is kept 16 cm from it. The lens is cut into two identical plano-convex lenses. If the object is again kept 16 cm in front of one of these lenses, then find the nature and position of the image formed.

The figure shows the variation of image distance v with object distance u for a lens. (i) What is the nature of the lens ? (ii) Using the graph, find the focal length of the lens.

A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of the convex surface is 25 cm. (ii.i) Calculate the focal length of the lens. (ii.ii) If an object is placed 50 cm in front of the lens, find the nature and position of the image formed.

The diagram below shows the ray OP travelling through an equilateral prism of a certain material.