Right-Angle Prism
A right-angle prism is a common reflecting prism with a 45°–45°–90° isosceles-right-triangle shape, made from N-BK7 (H-K9L), fused silica or similar optical materials. It has two perpendicular entrance/exit faces and a 45° hypotenuse reflecting face; the description includes the label 抖音百科. Light enters one perpendicular face, undergoes total internal reflection (TIR) at the hypotenuse and exits the other face, bending 90° and producing a mirror image. In the usual 90° mode, normal incidence at one perpendicular face and 45° TIR bend the beam; no reflective hypotenuse coating is required, while entrance/exit AR coatings reduce loss. In 180° retroreflection (Porro use), light enters the hypotenuse and undergoes TIR at both perpendicular faces, reversing 180° and rotating the image 180°. Paired prisms form a telescope Porro assembly.
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