A secreen is illuminated by a lamp which is one metre away. A sheet of glass is placed between the
Channel: Doubtnut
Date: 30/08/2020

A secreen is illuminated by a lamp which is one metre away. A sheet of glass is placed between the screeen and the lamp which has to be moved 10 cm nearer to maintain the same intensity of illumination as before. What fraction of light is absorbed by the sheet of glass?