Optical depth - absorbance


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.

Related formulas


τoptical depth of a material (dimensionless) (dimensionless)
Aabsorbance (dimensionless)