Corner Cube Retroreflector Prism Corner cube retro-reflectors reflect an image or beam back toward its original direction via three total internal reflections (TIR). The beam or image will be inverted and reflected through 180° even if the ... Inquire Price Sold by: Photonchina Ships from: China Specifications Type And Material: BK7, Sapphire, Ge, ZnSe, N-SF11, F2, CaF2, IRFS, UVFS, FS, Other Length: Not Specified Diameter: Not Specified Height: Not Specified Thickness: Not Specified