electron optics definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the branch of electronics having to do with the focusing and deflection of beams of electrons by means of electric and magnetic fields, which act upon the beams in the same way that lenses act on light rays
electron optics definition by American Heritage Dictionary
noun (used with a sing. verb)
The science of the control of electron motion by electron lenses in systems or under conditions analogous to those involving or affecting visible light.