Question

Question 1 (e)
Fill in the blank:
An image formed by a concave ________________ cannot be obtained on a screen.

Answer 1

An image formed by a concave lens cannot be obtained on a screen.

In a concave lens,

• When an object is placed at infinity, a virtual image is formed at the focus.
• When an object is placed at a finite distance from the lens, a virtual image is formed between pole and focus of the convex lens.

Whereas, a convex lens can form real images.