Question

A spherical lens is used to obtain an image on a screen. The size of the image is four times the size of the object. What is the type of lens and at what distance is the screen placed from the lens?

Answer 1

Data: M = -4, type of lens? v = ?

As the image formed by the lens is obtained on a screen, it is a real image. The lens is, therefore, a convex lens.

The distance of the screen from the lens = 5f.