What happens to the speed of light when it goes from (i) denser medium to rarer medium (ii) rarer medium to denser medium?
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When light travels from rarer medium to denser medium the speed of light decreases and when it travels from denser to rarer its speed increases
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When the speed of light passes from a denser medium to a rarer medium, it slightly bends towards the normal.
When the speed of light passes from a rarer medium to a denser medium, it tends to bend away from the normal.
If we take an example of air and glass, then the glass is the denser medium and air is the rarer medium. The phenomenon happens because light travels faster in denser mediums then the rarer mediums.
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