Question

An object is placed at a distance of 100 cm from a converging lens of focal length 40 cm.

(i) What is the nature of image ?

(ii) What is the position of image ?

A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.

Answer 1

(i) Since the object is placed at a distance greater than the focal length of the lens, so the image formed is real and inverted.

(ii) u = -100cm,f = 40cm

Image is formed 66.6 cm behind the convex lens.