Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O,F and 2F in each diagram.

Explanation

(a) For three times magnified real image, the object has to be held between F and 2F of a converging lens as

(b) For three times magnified virtual image, the object has to be held between optical centre O and principal focus F of convex lens as