August Beer

August Beer was a German physicist, chemist, and mathematician of Jewish descent. Beer published a paper in the field of spectroscopy on the absorption of red light in colored aqueous solutions of various salts, which is extended on the work from Pierre Bouguer's and Johann Heinrich Lambert's absorption laws. He found that the intensity of light transmitted through a solution at a given wavelength decreases exponentially with the path length and the concentration of the solute, when the solvent is non-absorbing.