Total Internal Reflection

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A ray of light is bent on passing from air to a liquid because its wavefront moves more slowly in water than in air. This change in angle is proportional to the propagation velocities, which are often specified by giving the refractive indices of the materials. By definition, a vacuum has a refractive index of 1.
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Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Total Internal Reflection"
http://demonstrations.wolfram.com/TotalInternalReflection/
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Published: March 7 2011