An optical spectrometer is a scientific instrument used to measure the properties of light across different wavelengths. It works by dispersing light into its component colors, allowing scientists to analyze the spectrum. This analysis can reveal information about the composition, structure, and physical properties of materials. These devices are commonly used in various fields, including chemistry, physics, and astronomy. For example, in astronomy, optical spectrometers help identify the chemical makeup of stars and galaxies. In chemistry, they assist in determining the concentration of substances in a solution by measuring how much light is absorbed at specific wavelengths.