The image of the sun is formed on the photosensitive metal with a convex lens and the
Channel: Doubtnut
Date: 30/08/2020

The image of the sun is formed on the photosensitive metal with a convex lens and the photoelectric saturation current obtained is I. If,the lens is replaced by another similar lens of half the diameter and double the focal-length, then photoelectric -current will be (Assume all lightpassing through lens felling on the photosensitive metal):