incident ray - the ray that approaches the boundary, refracted ray - the ray that has changed on entering the different medium, normal - an imaginary line drawn at 90º to the surface, angle of incidence - the angle from the normal to the incident ray, angle of refraction - the angle from the normal to the refracted ray, medium - the material through which the ray is travelling, ray - a narrow continuous beam of light, speed and direction - both of these change for a light ray entering a new medium,

Refraction

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