Lambert's First Law
- The illuminance on a surface illuminated by light falling on it perpendicularly from a point source is proportional to the inverse square of the distance between the surface and the source.
- Lambert's Second Law
- If the rays meet the surface at an angle, then the illuminance is proportional to the cosine of the angle with the normal.
- Lambert's Third Law
- The luminous intensity of light decreases exponentially with distance as it travels through an absorbing medium.
See also: Bouguer Law, Illuminance.
Subjects: Optics Physics