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Question
In following diagram shows a thin beam of white light from a source S striking on one face of a prism.

What conclusion do you draw from the observation in part (b) above?
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Solution
From the observation, we conclude that prism itself produces no colour.
RELATED QUESTIONS
How does the deviation produced by a triangular prism depend on the colours (or wavelengths) of light incident on it?
Write the approximate wavelengths for blue.
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Fig shows part of the arrangement for obtaining pure spectrum.
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(b) What are the conditions necessary for obtaining a pure spectrum?

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