Transmittance is the fraction of incident radiant flux transmitted through a specified object or boundary. Specify wavelength, angle of incidence, electromagnetic polarization and which outgoing light is collected.

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Transmittance is a measure of the fraction of incident light or radiation that passes through a material. It is defined as the ratio of the intensity of transmitted light (\(I_t\)) to the intensity of incident light (\(I_0\)): \[ T = \frac{I_t}{I_0} \] where \(T\) represents transmittance.