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when white light consisting  of seven colors falls on a transparent medium (glass prism) , each color in it is refracted ( or deviated ) by a different angle, with the result that seven colors are spread out to form a spectrum, The red color is deviated least , so it forms the upper part of the spectrum . On the other hand, Violet color is deviated the maximum, so violet appears at the bottom of the spectrum.
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They differ in wavelength
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