Question

(a) Explain what is meant by a virtual, magnified image. (b) Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly. (c) Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why ?

Answer 1

a) A virtual magnified image is the one which cannot be taken on a screen and whose size is larger than that of the object.

(c) Convex lens having 4cm focal length- because it will produce greatest magnification.