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Re: REFRACTION - REFLECTION

On Fri, 23 Jan 1998 08:01:42 -0600 Clarence Bennett <bennett@oakland.edu>
writes:

"explain why the wavefront must always perpendicular to the direction
of travel"

Non-swivel casters?

Yes.... but what about swivel casters?

Herb Gottlieb from New York City
(Where we have both swivel and non-swivel casters)