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Optical depth : ウィキペディア英語版 | Optical depth
In physics, optical depth or optical thickness, is the ''natural logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, and spectral optical depth or spectral optical thickness or is the natural logarithm of the ratio of incident to ''transmitted'' spectral radiant power through a material. Optical depth is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for optical depth is discouraged. In chemistry, a closely related quantity called "absorbance" or "decadic absorbance" is used instead of optical depth: the ''common logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, that is the optical depth divided by ln 10. ==Mathematical definitions==
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