principal visual ray

principal visual ray

[′prin·sə·pəl ′vish·ə·wəl ′rā]
(optics)
A perpendicular extending from a station point to a perspective plane and theoretically passing exactly along the visual axis of a viewing eye. Also known as principal ray.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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