Transmittance
Effectiveness of a material in transmitting radiant energy / From Wikipedia, the free encyclopedia
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This article is about transmission through a volume. For transmission through a surface, see Surface transmittance.
In optical physics, transmittance of the surface of a material is its effectiveness in transmitting radiant energy. It is the fraction of incident electromagnetic power that is transmitted through a sample, in contrast to the transmission coefficient, which is the ratio of the transmitted to incident electric field.[2]
Internal transmittance refers to energy loss by absorption, whereas (total) transmittance is that due to absorption, scattering, reflection, etc.