![]() ![]() For a certain area element dA of the reflecting surface, the (differential) incident radiant power is given by the surface's irradiance E e, multiplied with the size of the surface element, thusĪnd the (differential) reflected radiant power is given by the exitance M e, multiplied with the size of the surface element: In addition, reflectance, transmittance and absorptance might also depend on polarization and geometric distribution of the incident radiation, which therefore also have to be specified.The reflectance r is defined by the ratio of reflected radiant power to incident radiant power. For the latter, the spectral distribution of the incident radiation has to be specified. Thus, these three processes can either be quantified for monochromatic radiation (in this case, the adjective "spectral" is added to the respective quantity) or for a certain kind of polychromatic radiation. In general, reflection, transmission and absorption depend on the wavelength of the affected radiation. Reflectance r, Transmittance t, and Absorptance a
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