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How could you show that the colours of the spectrum combine to give white light?
We can show that the colours of the spectrum are combined to give white light, which is done by allowing the colours of the spectrum coming through the first prism to pass through another inverted glass prism placed behind the first prism.
We know that a spectrum of colours is formed when a narrow beam of white light is passed through a transparent glass prism. These colours can be recombined to give white light again, by placing a second identical prism in an inverted position with respect to the first prism. A patch of white light is obtained on a screen placed behind the second prism because the refraction produced by the second prism is equal and opposite to that produced by the first prism.
Image is posted for reference only
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