normal ray

normal ray

[′nȯr·məl ′rā]
(optics)
A ray that is incident perpendicularly on a surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In the second mutation, which results in the tubular florets, the insertion of a "jumping gene" disrupts the ability of the plant to produce normal ray florets.
The ray perpendicular to the reflector in J point (named normal ray) emerges with an angle [beta] at [x.sub.o] point spending [t.sub.0] to travel from [x.sub.o] to J and back to [x.sub.o] (zero offset traveltime).