Please tell me one thing.
What is the real cause of deviation produced by a prism?
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can't understand your question
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The emergence of different colours of light from a triangular prism at different angles leads an observer to see the component colours of visible light separated from each other. Thus, deviation is caused in a prism. when a ray of light enters a prism, it deviates, thus is because of change in the refractive index.
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