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?

Just put them side by side.

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one placed on top of the other .

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one placed inverted with respect to the other.

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none of these.

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Solution

The correct option is C one placed inverted with respect to the other.
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.

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Q. Question 19
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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The emergent beam of light from the second prism will be:

[0.8 mark]

When we place a glass prism in the path of a narrow beam of white light a spectrum is obtained. What happens when a second identical prism is placed in an inverted position with respect to the first prism? Draw a labeled ray diagram to illustrate it.

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