A beam od white light falling on a glass prism gets a split into seven colour marked 1 to 7
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When a beam of white light falls on a glass prism dispersion occurs due to different velocities of different light and then refraction occurs due to which white light gets split and refracts and a spectrum is seen.From up to down,the first colour i.e 1 is Red, 2-Orange,3-Yellow,4-Green,5-Blue,6-Indigo and then last i.e 7th-Violet.
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