Lambert's laws

/ˈlæmbəts lɔz/ (say 'lambuhts lawz)

noun three laws of illuminance which state that:
1. the illuminance of a surface from a point source of light is inversely proportional to the square of the distance between the surface and the source.
2. illuminance is proportional to the cosine of the angle between the light rays and the normal to the surface.
3. luminous intensity falls exponentially with distance in an absorbing medium.
{from Johann Heinrich Lambert, 1728–77, German physicist and astronomer who devised these laws}

Australian English dictionary. 2014.

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