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what do you understand by the term refraction of light?

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the phenomenon, due to which a ray of light deviates from its original path, while travelling from one optical medium to another optical medium is called refraction of light.
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Refraction is the bending of light as it passes from one substance to another. Here the light ray passes from air to glass and back to air. The bending is caused by the differences in density between the two substance. 

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