what is spectrum...
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spectrum, plural: spectra, is a band of several colours: violet, indigo, blue, green, yellow, orange and red. A spectrum can be seen if the Sun's light is passed through a prism and allowed to gather on a white screen. This visible spectrum is part of the larger electromagnetic spectrum.
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Spectrum, in optics, the arrangement according to wavelength of visible, ultraviolet, and infrared light. ... An instrument designed for visual observation of spectra is called a spectroscope; an instrument that photographs or maps spectra is a spectrograph.
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