0.1.7 Total Internal
Reflection
- Beams on blackboard - total
internal reflection is shown well with the blackboard optics prism piece. As
you rotate the prism shown above counter-clockwise, the refracted beam will
become parallel to the hypotenuse; at this point the reflected beam becomes
much brighter and the refracted beam disappears. You can use your value for
the index of refraction from O.1.1a to check against the critical angle.
- Laser beam in aquarium - a
horizontal laser beam in an aquarium of water is reflected towards the
surface with a small mirror. You can show the angle at which the beam
penetrates the surface and the angles for which it is totally reflected.
- Pieces of bent lucite rods
and sections of fiber optics bundles are available to show the bending of
light through light pipes.
- The water stream laser light-pipe is an impressive demonstration of light totally internally
reflecting in a flowing stream of water.
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