This relation is only valid if the interacting entities are homogeneously distributed in the medium and do not scatter the incoming radiation, which must come in via parallel and preferably monochromatic rays.
This relation is only valid if the interacting entities are homogeneously distributed in the medium and do not scatter the incoming radiation, which must come in via parallel and preferably monochromatic rays. It describes the adsorption of light as it relates to the properties of the media in showing that the  transmissivity of light depends logarithmically on the product of the adsorption coefficient of the substance and the path length of the light. FTP, expressing what equation in terms of absorbance yields an equation that shows that absorbance is proportional to concentration, where concentration is the adsorption  coefficient divided by the molar absorptivity?
This relation is only valid if the interacting entities are homogeneously distributed in the medium and do not scatter the incoming radiation, which must come in via parallel and preferably monochromatic rays.
Beer-Lambert-Bouguer Law