Who discovered the Beer-Lambert Law?

The Beer-Lambert Law is the result of the work of two prominent scientists: Johann Heinrich Lambert, who laid the theoretical foundation for the relationship between light and matter in 1760, and August Beer, who, in 1852, refined the law by linking absorbance directly to concentration and molar absorptivity. Lambert’s earlier work focused on how light intensity decreases as it passes through a medium, while Beer’s contributions were more directly focused on the relationship between absorbance and concentration in solutions. Together, their work established the Beer-Lambert Law, which has become fundamental in analytical chemistry, particularly in spectroscopy.