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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?
- Just put them side by side.
- one placed on top of the other .
- one placed inverted with respect to the other.
- none of these.
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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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In an experiment, Rakesh used an equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. He placed a screen on the other side and saw many colours appearing as patches on the screen. But when he placed a second identical prism in an inverted position with respect to the first prism, he found a beam of white light emerging out from the other side of the second prism.
If the white ray falls on the system arranged in the given way, then what will be the topmost colour of the output light coming from the third prism?
If the white ray falls on the system arranged in the given way, then what will be the topmost colour of the output light coming from the third prism?
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Q5
A beam of white light passes through two inverted prisms as shown.
The emergent beam of light from the second prism will be:
[0.8 mark]
The emergent beam of light from the second prism will be:
[0.8 mark]
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