State and explain the laws of refraction of light with the help of a labelled diagram.
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Laws of refraction,

First law: According to the first law of refraction, the incident ray, the refracted ray and the normal at the point of incidence, all lie in the same.
Second law: According to the second law of refraction, the ratio of the angle of incidence to the point of incidence, all lie in the same plane.
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