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Light changes its speed in denser medium because refractive index of light is greater in the denser medium.
hope it helps u.....
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•Light changes its speed in denser medium because in denser medium there are more number of particles as compared to rarer medium .

• So , in denser medium light starts colliding with the particles due to which its speed gets decreased as compared to less colliding in rarer medium like air

• Hope it helps ^_^
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