Question

The image of an illuminated square is obtained on a screen with the help of a c
onverging lens. The distance
of the square from the lens is 40 cm. The area of the image is 9 times that of the square. The focal length
of the lens is​

Answer 1

Explanation:

The image of an illuminated square is obtained on a screen with the help of a converging lens. The distance of the square from the lens is 40 cm. The area of the image is 9 times that of the square.