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Transmittance
Diagram of Beer-Lambert Law of transmittance of a beam of light as it travels through a cuvette of width
l .
Transmittance of ruby in optical and near-IR spectra. Note the two broad blue and green absorption bands and one narrow absorption band on the wavelength of 694 nm, which is the wavelength of the ruby laser.
In optics and spectroscopy, transmittance is the fraction of incident light at a specified wavelength that passes through a sample. A related term is absorptance , which is the fraction of light absorbed by a sample at a specified wavelength. Occasionally one also hears the terms visible transmittance ( VT ) and visible absorptance ( VA ), which are the respective fractions for the spectrum of visible light.
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