Why deviation is caused by prism?
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Answer:
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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Explanation:
it is caused by prism because angle of emergence is equal to the angle of reflection.
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