engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 Electrician and Wireman Light and Illumination Illumination
Which law states that the illumination of a surface at any point is proportional to the cosine of the angle between the normal at the point and the direction of the luminous flux?
1
Inverse cosine law
2
Inverse square law
3
Lambert's cosine law
4
Lambert's sine law