Retroreflectors or Corner cube

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Materials	All Glass types, Fused Silica & Infrared Crystal Materials
Deviation	180 deg ± 2 arc sec
Flatness	/4
Surface Quality	60 - 40 scratch & dig
Dimensions Tolerance	± 0.15 mm
Dimensions Available	5 mm ø - 70 mm ø

The input Beam entering the effective aperture of a retroreflector will emerge opposite and parallel, to the input beams, parth of propagation.