Perpendicular rays are two rays that intersect one another to form four right angles. Below is an image that shows two perpendicular rays.
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An angle is formed by two rays with the same endpoint. If the two rays are perpendicular to one another, they form a right angle.
Perpendicular is the word I think you are looking for
when angle of incidence is equal to the brewster's angle, the reflected and refracted rays are perpendicular to each other. show it mathematically.
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what quadrilateral has exactly two perpendicular sides.