Amazon.com: YEHUOT Long Range Tactical Blue Purple Laser Beam Flashligh with USB Charging ,Adjustable Focus Light Pointer for Night Astronomy Outdoor Camping and Hiking, Small Breeds : Sports & Outdoors
Physicists make laser beams visible in vacuum
Green and blue laser beams reflecting off mirrors in parallel lines. Laser, science, light, visible beam, collimated, focussed, colourful Stock Photo - Alamy