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.

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