|Material||N-BK7 or equivalent||Dimension Tolerance||+0/-0.2mm|
|Surface Quality||60/40 S/D||Clear Aperture||>80%|
<λfirstname.lastname@example.org for big surface,
<λemail@example.com for small surfaces
|Deviation||Up to 180°±5 arc seconds||Coating||None, Available|
Optical corner reflectors, called corner cubes, made of three-sided glass prisms, are used in surveying and laser ranging.
Three reflecting surface, each of them is perpendicular, corner cube reflector can return an incident light beam in the original direction whatever the incident direction it is.