what is angle of deviation

The angle of deviation is a term used in optics to describe the angle formed between the angle of incidence and the angle of refraction of a ray of light while moving through the surface between one medium and another of different refractive index. It is equal to the difference between the angle of incidence and the angle of refraction of a ray of light passing through the surface between two media. The angle of deviation is important in the study of prisms, where it is the angle between the direction of the incident ray and the emergent ray. The angle of deviation is related to the refractive index of the material and can be used to calculate it. The angle of minimum deviation is the angle of deviation in a prism that is at its minimum, and it is related to the refractive index of the material. The angle of deviation is different from the angle of deflection, which is the angle between the incident ray and the refracted ray.