How could you show that the colours of the spectrum combine to give white light ?

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Solution

Colours of a spectrum from one prism are allowed to fall on a similar prism placed adjacent to the first prism, but in inverted position. The refraction produced by second prism is equal and opposite to that produced by the first prism. This makes the colours of the spectrum combine to give white light.

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How can you show that white light (say, sunlight) consists of seven colours?

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