Usual positive phase and group refraction for Pim-Pim.
This is the familiar positive refraction. Note how the front
crosses the surface in such a way that Snell's law is satsfied.
No part of the front stops or goes at odd speeds.
The next movie shows how a front can never cross
from PIM to NIM so as to satisfy a negative Snell's law.
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© 2002 CEMD, University of Texas at Austin. All rights reserved.
