from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from the GNU version of the Collaborative International Dictionary of English

  • adj. the point from which rays, having been rendered divergent by reflection of refraction, appear to issue; the point at which converging rays would meet if not reflected or refracted before they reach it.


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