p A right-angle prism is a prism with specific geometric structure and optical properties. Its core feature is that it contains at least two mutually perpendicular surfaces (right-angle surfaces) and a slanted surface (or called the reflecting surface) used for reflecting or refracting light. Through total reflection or refraction, it can achieve the deflection of light direction (such as 90° or 180°), image inversion or optical path folding. During total reflection, the energy loss is extremely low, and the optical efficiency is superior to that of ordinary mirror reflection.

Applied in the fields of optical instruments and telescopes, lasers and optical systems, photoelectric communication and sensing.