When a ray incident occurs in one medium and goes in another medium, this phenomenon is called refraction. And when a ray incident occurs at one medium and goes in the same medium after touching its surface, this is called reflection.Angle of deviation is an angle between the original ray and the final ray. In other words, the angle of deviation is the inclination between the original and final ray.
The refractive index of the material of a prism is 1.5 and its refracting angle is 6°. find the deviation produced by the prism for a small angle of incidence.
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Principal, Babu Daudayal SVM, Mathura