Bending, This word should never be used to refer to refraction., Medium, The material through which the ray is travelling., Angle of Refraction, The angle from the normal to the refracted ray., Angle of Incidence, The angle from the normal to the incident ray., Frequency, This remains constant when the material refracts., Ray, A narrow continuous beam of light., Speed and Wavelength, These change when a ray changes between two different optically dense materials., Refracted Ray, The ray that has changed on entering the different medium., Incident Ray, The ray that approaches the boundary., Normal, An imaginary line drawn at 90o to the surface..

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