Final answer:
The concentration of a substance being proportional to light absorbed is described by Beer's law, not Boyle's, Avogadro's, or the inverse square law.
Step-by-step explanation:
The concentration of a substance being directly proportional to the amount of light absorbed and inversely proportional to the logarithm of the transmitted light is described by Beer's law.
This law relates the absorption of light to the properties of the material through which the light is traveling.
Boyle's law refers to the pressure of a gas being inversely proportional to its volume, and Avogadro's law states the number of molecules in a gas is directly proportional to its volume.
The inverse square law for light details how light intensity diminishes with the square of the distance from the source, an unrelated concept to the concentration of substances in solution.
Comparatively, Henry's law involves the solubility of gases in liquids, focusing on the concentration of the gas being directly proportional to its partial pressure above the liquid.