Question
Thu January 31, 2013 By:

What are the causes of refractation of light?

Expert Reply
Fri February 01, 2013
There are many theories.
One of the most accepted theory is by Hygens
He said that the distance travelled by a wavefront of light per unit time is same in all the mediums.
SO due to lower speed of light in other optically denser mediums, the light bends towards the normal so as to travel equal distance with respect to normal.
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