Question

A convex lens is made up of three different material as shown in the figure. Then the number of images it forms will be

• A. Three images are formed at same place.
• B. Three images are formed at different place.
• C. Only one image is formed.
• D. No image is formed.

Answer 1

The correct option is B Three images are formed at different place.

REF.Image

three part in lens, each part different

RI so, focal length of each part

is different because, focal length

depend upon RI $\left(\mu \right)$

$\frac{1}{f}=(\mu -1)[\frac{1}{R_1}-\frac{1}{R_2}]$

so, three focal length will formed

and each focal length will give one image

= no. of image formed 3

Hence B option is correct.