question_answer

A convex lens is made of 3 layers of glass of 3 different materials as in the figures. A point object is placed on its axis. The number of images of the object are

A)  1                                            

B)  2

C)  3                                            

D)  4

Correct Answer: A

Solution :

A lens made of three different materials as shown have only one focal length. Thus, for a given object there is only one image.