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 process of reflecting light hitting the boundary of a more dense medium at greater than the critical angle, medium, the material through which the ray is travelling, ray, a narrow continuous beam of light, The angle of refraction, S, The angle of incidence, Q, fibre optics, a system that uses TIR for communication and the Internet.

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