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　　　　Corner Cube Retroflectors are used to reflect light beam back to the direction that it comes froThe reflected beam is always parallel to the incident beam, and it travels in the reverse directionof the incident beam. This holds true regardless of the angle of incident beam. The beam reflection is achieved either through total internal reflection or by a mirror coating on the rear surfacesof the retro-reflector. An incident beam, filling the effective aperture, is reflected exactlyback on itself. Protective AL coating can be applied to the rear reflecting surfaces to avoid
total internal reflection failure at high incident angle.

Material:	BK7
Diameter Tolerance:	+0.0/-0.2mm
Deviation:	180°±3 arc seconds
Flatness:	l/4 on big surface,l/10 on other surfaces
Surface Quality:	60/40
Wavefront Distortion:	l/4 @ 632.8nm
Clear Aperture:	>80%
Bevel:	<0.2-0.5mm X 45°
Coating:	Uncoated