For 10 points, name this law that states that the absorbance is linearly proportional to concentration, a fundamental law of spectrophotometry.
One coefficient sometimes used in this law is equal to four pi times the imaginary part of the index of refraction divided by the wavelength of the incident light. The molar extinction coefficient is more prevalently used than the aforementioned absorption coefficient. There are actually two forms of this law, one of which holds optical path length constant and the other of which holds molar concentration constant. For 10 points, name this law that states that the absorbance is linearly proportional to concentration, a fundamental law of spectrophotometry.
One coefficient sometimes used in this law is equal to four pi times the imaginary part of the index of refraction divided by the wavelength of the incident light.
Beer-Lambert-Bouguer Law [or Beer's Law; or Lambert's Law; or Lambert-Beer Law]