What is a 'spectrum”?
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- A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.
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a band of colours, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength
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