Answers

2015-10-04T13:43:22+05:30
The reason is when light rays travel from one medium to another medium there is a change in velocity.
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2015-10-04T13:47:59+05:30
Refraction is the bending of wave where it enters a medium where its speed is different .when it passes from rearer medium to denser medium it bends towards the normal and when it passes from denser to rarer it bends away from the normal
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