Date: Fri, 27 May 2005 11:34:40 -0400

Author: Judith Elwell

Subject: TIR Demo


A professor wants a demonstration of total internal reflection. The
idea is to point a laser at an angle towards a notch in the top of a
plastic cylinder. The laser light then spirals down around the
cylinder. The cylinder should be big enough for a classroom to see
it-about 30 cm tall, 20 cm diam.

Are there any suggestions about how to build one, such as, type of
plastic, minimum thickness of cylinder, any other consideration.


From Fri May 27 11:49:09 2005