Question

A convex lens is made up of three different materials as shown in figure. How many of images does it form?

Answer 1

ANSWER

i) Given convex lens is made up of three different materials.

ii) The three different materials have three different refractive indices.

iii) So the given lens have three different focal lengths. Hence it forms three images.

Answer 2

Answer: Three

Explanation:

The convex lens is made up of three different materials, So they will have different refractive indices and different focal lengths of each of the lenses.

$By\ lens\ formula:1/v-1/u=1/f\\Here, \ u\ is\ same\ for\ all\ three\ lenses \\Therefore, 1/v\propto 1/f\\v\propto f$

Here, since the focal length is different the image distance will be different for each lens.

Thus, When a point object is placed on the principal axis, 3 images will be formed one from each lens of the same object.

Here, the figure is not provided but I assume the lens has three different materials arranged vertically.in that case the number of images will be three.