A vertical shaft of light from a projector forms a light spot `S = 100 cm^(2)` in area on the cellin
Channel: Doubtnut
Date: 2020-08-16

A vertical shaft of light from a projector forms a light spot `S = 100 cm^(2)` in area on the celling of a round room of radius `R = 2.0 m`. The illuminance of the spot is equal to `E = 1000 1x`. The reflection coeffiecient of the celling is equal to `rho = 0.80`. find the maximum illuminance of the well produced by the light reflected from the celling. the reflection is assumed to obey Lambert's law.