Question

Why does a beam of light bend when it enters glass at an angle ? Why does it not bend if it enters the glass at right angles ?

Answer 1

A beam of light bends when it enters glass at an angle. This is due to refraction of light. It does not bend if it enters the glass at right angles because no refraction will occur in this case, the angle of incidence in this case is zero and angle of refraction is also zero.