The simplest device to measure interaction of a sample with light is the absorbance spectrophotometer. Monochromatic light is passed through the sample (or, in some cases, reflected from it). If absorption occurs, the light intensity that arrives at a detector is lower than what would arrive in the absence of the sample.
Monochromatic Light Isosbestic Point High Optical Quality Absorbance Spectrophotometer Hyperchromic Effect
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