What is called the refraction of light, the angle of incidence, the angle of refraction?

The change in the direction of propagation of light when crossing the interface between two transparent media is called refraction of light. The angle between the incident ray and the perpendicular drawn to the interface between the media at the point of incidence is called the angle of incidence. The angle between the perpendicular to the interface between the media and the refracted ray is called the angle of refraction.

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