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, critical angle, the angle where the refracted ray is at 90º to the normal, total internal reflection, the complete reflection of a light ray reaching a boundary with a less dense medium when the angle of incidence exceeds the critical angle., medium, the material through which the ray is travelling, ray, a narrow continuous beam of light, fibre optics, a system that uses TIR for communication and the Internet, bending, this word should never be used to refer to refraction, frequency, this remains constant when a material refracts, speed and wavelength, these change when a ray changes between two different optically dense materials.

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