Question

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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Answer 1

When two identical prisms are placed in such a way that one is placed inverted with respect to the other and a narrow beam of white light is incident on one, it emerges out of the second prism as white light. Angle of deflections of the two prisms are equal and opposite. While the first prism splits the light in the seven colours due to different angles of deflection, the second prism combines the spectrum along a single ray and the colours again combine to give white light as the emergent light.

Answer 2

Answer:

Here is the ans

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