In a plane mirror the rays of light falling on it are reflected with little change in their original character and their relationship to one another in space. The apparent position of the image is the same distance behind the mirror as the actual object is in front of the mirror; the image is the same size as the object and is called a virtual image (i.e., the rays of light from the object do not actually go to the image, but extensions of the reflected light rays appear to intersect behind the mirror).
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.