31. With the help of a ray diagram. State the meaning of refraction of light. State
law of refraction of light and also express it mathematically.
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Explanation:
The change in the direction of light when it passes from one medium to another obliquely, is called refraction of light.
In other words, the bending of light when it goes from one medium to another obliquely is called Refraction of light.
Snell's law:
The ratio of sine of angle of incidence to the sine of angle of refraction is constant for given pair of media
sin i/ sin r = n
or n1 sin i=n2sin r
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