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Question: what are the causes of refraction ? State each of them .
Refraction is the phenomenon of bending of light at the boundary of two mediums.Refraction is caused due to the change in speed of light when it enters from one medium to another.e.g., 1. when light goes from air into water it bends towards the normal because there is a reduction in its speed 2. when light goes from water to air it bends away from the normal because three is an increase in speed of light.
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