| When light
passes from one transparent medium to another, some of it is reflected,
while the rest is transmitted through the material and is refracted
or bent. At this exhibit, a plastic semi-circle which can be rotated
lies in the path of a beam of light. As the semi-circle is turned,
some of the light is bent in a new direction, while the remaining
light is reflected. At the critical angle, all the light
is internally reflected and the transmitted beam disappears.
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