what is angle of refraction
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the angle between a refracted ray and the normal drawn at the point of incidence to the interface at which refraction occurs.
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Angle of refraction The angle between a refracted ray or wave and the normal to a refracting surface. The angle of refraction is related to the angle of incidence by Snell's law. A ray or wave entering a medium in which its speed is higher than in the medium it is leaving will deviate away from the normal, whereas when it enters a medium of lower speed it will deviate towards the normal.
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