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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