A light source with an area S = 0.5 cm2 is projected onto the screen by a lens with a focal length F = 30 cm. The distance between the source and the lens is a = 120 cm. The diameter of the lens is D = 5 cm. Determine the illumination of the image of the light source on the screen if the luminous intensity of the source is I = 40 light.

Detailed solution. Format gif