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The incident ray,the refracted ray and the normal at the point of incidence,all lie in the same plane.
the ratio of the sine of the angle of incidence i to the sine of the angle of refraction r is constant for the pair of given media. this constant is called the refractive index of the second medium with respect to first medium.

the above laws are known as SNELL's law.
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N1sin thitha = n2sin thitha.
it is also known as the law of refraction.
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