This angle of incidence is called the critical angle. At a certain angle of incidence, the light will refract 90 degrees and travel along the boundary between the two media. The diagram below shows the light refracting from glass into air.Īs the angle of incidence is increased, the angle of refraction also increases. The angle of refraction is greater than the angle of incidence. When light travels from a denser medium, eg glass, to a less dense medium, eg air, the speed of the light increases and the light refracts away from the normal. When light travels into a different medium, the speed of the light changes and the light is refracted (see The features of waves ). The conditions for total internal reflection
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