When a light ray passing from one medium falls on a surface and passes through another medium by bending exactly at the separation of 2 media, then refraction occurs.
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The bending phenomena of light ray when travelling from a medium of certain density to other medium of different density is known as "refraction".
1)A light ray bends towards normal when entered into a denser medium from rarer.
2)It bend away from normal when entered rarer medium from a denser medium.
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