SupportGlossary Optical Processes & Properties 

Transmission

The fraction of light that reaches a receiver with a narrow field of view, a specified distance from a source generating a narrow beam (a transmissometer).  Transmission is usually expressed as a percentage, and the path length over which it was measured must be specified in order for it to be meaningful.  It is preferable to express this in terms of the beam attenuation coefficient (c) which automatically accounts for the path length.
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