Before Ships Used GPS, There Was the Fresnel Lens - frensel lens
Class 2M laser components should not cause permanent damage to the eye under reasonably foreseeable conditions of operation, provided that:
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Class 3R laser products emit radiation where direct intrabeam viewing is potentially hazardous, but the risk is lower with 3R lasers than for 3B lasers. Fewer manufacturing requirements and control measures for 3R laser users apply than for 3B lasers.