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virtual focus

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virtual focus  
n.  The point from which divergent rays of reflected or refracted light seem to have emanated, as from the image of a point in a plane mirror.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: virtual focus
Function: noun
: a point from which divergent rays (as of light) seem to emanate but do not actually do so (as in the image of a point sourceseen in a plane mirror)
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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