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glossary
Diffusion
: phenomenon by which a radiation is deflected in various directions by interaction with other objects
Reflectance
: reflection coefficient related to the intensity
Divergence
: defines the maximum angle between the light rays of a beam
Irradiance ( radiometry )
: optical power received by unit area
Radiance ( radiometry )
: for a light source or a diffusing/reflecting surface, power emitted per unit of solid angle and per unit of apparent area
