refraction Hear it!

refraction definition - telecom
The bending of electromagnetic waves caused by a change in the velocity of propagation (Vp) as they pass from a medium of a given density into a medium of another density at an oblique angle. The extent to which this phenomenon occurs is termed the index of refraction (IOR). See also IOR, reflection, and Vp.

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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