Question

drcribe Newtons disc experiment to show that white light is composed of seven colors .Why seven colors combine to give almost white but not perfectly white?
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Answer 1

Answer:

Split the disc into seven equal sections. Colour the first section with violet, the second with indigo, the third with blue, and so on in the order of VIBGYOR in an anticlockwise direction. Drill a suitable hole in the centre of the disc. ... Your eyes would see all the colours at once and disc would appear to be white.