Various laws of photometric quantity

Photometric quantity is the amount of radiation that is evaluated according to the visual characteristics.

The basic law of the photometry is to make light illumination and light source, namely the inverse square law: the intensity of illumination and point light source is proportional, is inversely proportional to the square distance; and illumination light and incident angle relationship, namely the angle cosine law: one on one side and light illumination the angle of incidence (the formation of the surface normal direction angle and incident angle is proportional to the cosine).

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