P. 4567. There is a well-illuminated goldfish at rest in an aquarium, which has thin walls, 12 cm away from the wall. With the help of a lens, which has a power of 10 dioptres, an enlarged image is to be formed on a screen. The image should be five times as big as the fish. Where should the lens and the screen be placed? (The refractive index of water is 1.33.)
Deadline expired on 11 November 2013.