| quotient of the spectral radiant flux reaching the exit internal surface of the layer and the spectral flux that enters into the layer after crossing the entry surface Note 1 to entry: For a given layer, the spectral internal transmittance depends on the path length of the radiation in the layer, and hence, in particular, on the angle of incidence. Note 2 to entry: The spectral internal transmittance has unit one. Note 3 to entry: This entry was numbered 845-04-81 in IEC 60050-845:1987.
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