A spectrometer is a scientific instrument that decomposes light of complex composition into spectral lines, consisting of prisms or diffraction gratings, etc. Using a spectrometer, light reflected from the surface of an object can be measured. The seven colors of light in sunlight are the parts that can be divided by the naked eye (visible light), but if the sunlight is broken down by a spectrometer and arranged by wavelength, visible light only accounts for a very small range of the spectrum, and the rest are spectra that cannot be distinguished by the naked eye, such as infrared, microwave, ultraviolet, X-rays, etc.
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