light ray passes from rarer medium to denser medium.
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When a ray of light enters from a rarer to denser medium light bends. But if the ray light moves from denser to rarer medium light moves away from the normal. Since the speed of light changes as it enters from a rarer to denser medium the frequency of light does not change but its wavelength changes.
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When a ray of light enters from a rarer to denser medium light bends towards the normal
Since the speed of light changes as it enters from a rarer to denser medium the speed of light slows down.
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