Question

derive an expression for Beer-lambert law​

Answer 1

Answer:

It is often attributed to Johann Heinrich Lambert, who cited Bouguer's Essai d'optique sur la gradation de la lumière (Claude Jombert, Paris, 1729)—and even quoted from it—in his Photometria in 1760. Lambert's law stated that absorbance of a material sample is directly proportional to its thickness (path length).