what is Newton's disc
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A Newton disc, invented by Isaac Newton, is a disc with segments in rainbow colours. When the disc is rotated, the colors fade to white; In this way Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow.
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It is a coloured disc which is painted with the component colours of white light in the correct proportion (i.e., VIBGYOR). So that when it is rotated very fast, the disc appears white.
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