Question

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen
1. half of the image will disappear
2. image will not form on the screen
3. intensity of image will increase
4. intensity of image will decrease

Answer 1

Correct Answer - Option 4 : intensity of image will decrease

A converging lens is used to form an image on a screen.

As upper half is covered, intensity of upper half part will not reach at the image, so intensity of image will decrease but image will be formed because there are many rays from the lower half which completes the image. So, intensity of the image will decrease and no part of image will disappear.