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BAE Systems Sensor Solutions - Fairchild - Thermal Imaging Solutions 4/24 LB
Photonics Dictionary

Lambert's cosine law

Flux per unit solid angle leaving a surface in any direction is proportional to the cosine of the angle between that direction and the normal to the surface. A material that obeys Lambert's cosine law is said to be an isotropic diffuser; it has the same sterance (luminance, radiance) in all directions.
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