noun
right-angle prism
Optical prism with one or more right angles, used to reflect or deviate light by 90° or 180°.
直角プリズムは光路を90度曲げるのに使われる。
A right-angle prism is used to bend the light path by 90 degrees.
General term for any prism; 直角プリズム specifically denotes a right-angle prism.
Compound of 直角 (right angle) and プリズム (prism, from English).