right-angle prism

right-angle prism

[′rīt ¦aŋ·gəl ′priz·əm]
(optics)
A type of prism used to turn a beam of light through a right angle (90°); it will invert (turn upside-down) or will revert (turn right for left), according to the position of the prism, any light reflected by it.
References in periodicals archive ?
Other products include: a light crystal, a right-angle prism, magnets, a compass, a puzzle, strategy games, Moire' Array-a set of films and cards, Reflecto-a mirrorized activity toy, and the new Flippers, which are colorful plastic pieces that retail for slightly more than $2.