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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