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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