Corner cube retroreflectors are designed to reflect any ray or beam entering the prism face, regardless of the orientation of the prism, back onto itself. A mirror will only do that at the normal angle of incidence. As a result, corner cube retroreflectors are ideal where precision alignment is difficult or time-consuming. They feature three total internal reflections and will function even at very large angles of incidence. TECHSPEC® UV Fused Silica Corner Cube Retroreflectors are made from UV Fused Silica which features low thermal expansion and excellent transmission throughout the UV, VIS, and NIR spectral ranges.