Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA.

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The deck prism is a very primitive fiber optic conduit used primarily in sailing ships.

The ulexite is sometimes called "TV Rock".  It is a natural fiber optics matrix made up of sodium calcium borate crystals in a tubular arrangement.  

Two sets of fiber optics light pipes from the fiber optics demonstrator kit may be used to show some interesting effects.  Wet the end of one of the light pipes with glycerin and press to the other light pipe at the position where the laser beam strikes the edge.  The laser beam should be directed outside the first light pipe and into the second.