Why does a beam of light bend when it enters a glass at an angle why does it doesn't band if it enters the class at right angle?
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Answer:
The light when enters the glass at an angle it bends due the phenomenon called refraction. Due to change of medium the phase velocity of light changes .
Explanation:
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When a light ray goes from rarer to denser medium, then as we increase the angle of incidence and reflection also increases, so the angle of incidence for which the angle of refraction becomes 90 degree is called critical angle
if further increase the angle of incidence, at one point the ray will completely reflect back in same medium
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