A spectrometer is a scientific instrument used to measure the intensity of light as a function of wavelength. By dispersing light into its constituent wavelengths, it generates a spectrum that reveals information about the chemical composition and physical structure of the light source or material being analyzed. These devices operate based on the principle that different elements and substances absorb, emit, or transmit light at specific, characteristic wavelengths. Applications span various scientific fields, including analyzing the elemental composition of astronomical objects, determining the concentration of chemical species in solutions, and studying the energy levels within molecular systems. Modern spectrometers come in various configurations, utilizing different physical principles, such as diffraction gratings or prisms, to achieve precise spectral measurements.