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can a colorless , human contact safe beam, IR or laser reflect off of only mirror?

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Are there human contact safe devices that project colorless (not visible) beams of light, Infrared, or lasers intended to reflect only off of mirrors? Can they be manipulated to strobe? What is the maximum distance that they may be projected?
asked Mar 23, 2017 in Optics by ronfunes (120 points)

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