Right Angle Prism can be used to bend a beam by 90deg or 180deg, depending on which face is entrance face. Please refer to following image to see how it works. Horse Optical provides K9 Right Angle prisms with dimensions ranging from 5mm to 300mm, with aluminum plating and black paint protection on the reflecting surface, and a single layer of MgF2 antireflective film on the incident and outgoing surfaces. Horse Optical is a professional optical component supplier in China. We can customize various prisms to meet your usage requirements according to your needs. Special size can also be offered upon request.If you have any questions or needs, you can contact us and we will be happy to serve you.