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  • How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram.

How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram.

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Explanation:-

In the normal orientation of a prism, we have:

If we place another prism in front of this prism, we get:

The angle of deflections of both the prisms is equal and opposite. The first prism splits the white light into seven constituent colors, and the second prism combines these colors back into a single ray to give white light as the emergent light.

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