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Right angle prism is deviating or deflecting a beam of light with 90° or 180°. It is often used in telescope, periscope and other optical system. Furthermore, Laser grade right angle prism is also available by Tempotec. Please see the following chapter “ laser optics” for more information.    

A Right-Angle Prism is used as a mirror to deviate light through 90 degree, and also as a retroreflector to deflect light throgh 180 degree by total internal reflection.   

90-degree Deflection   

90 degree deflection occurs at the hyotenuse face.The image is erected and reversed.    


180-degree Deflection   

180 degree deflection uses with hypotenuse as the entrance and exit face.   

The mail application of it is used as a retroreflector provided that the plane of incident beam includes the vertex.    



Material: BK7 glass or UV fused silica    

Dimension Tolerance: +0.0, -0.2 mm 

Clear Aperture: >80%    

Beam deviation: 3', 1' or 30"    

Flatness:  λ/2 @632.8 nm        

Surface Quality: 60-40 scratch and dig      

Protective Bevel