Spectroscopy is the science that deals with the examination and analysis of spectra, with the use of a spectroscope or a spectrometer. The simplest spectroscope is an instrument used to obtain and examine the spectrum of visible light by the passage of visible light through a prism. In most spectroscopy, one energy of light, or a range of energies of light (e.g., Microwave, Infrared, visible, ultraviolet, X-rays, or gamma rays), impinge on a sample and the amount of light absorbed at each energy is recorded.