@larry_laser: Laser mirrors are super different from the mirror in your bathroom Thin film coatings of materials like metal oxides make the reflectivity extremely high for specific laser wavelengths, as high as 99.999% And yes, this mirror is filthy. I use it specifically for educational demos for students Optical engineer Cory Boone breaks down weird optics facts and how light is used to do amazing things in these short, educational videos Introduce a kid in your life to science and optics with the Larry Laser kids' books, available through Amazon and the publisher SPIE's website! #Science #physics #optics #stem #engineering

Larry Laser

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Tuesday 17 February 2026 12:02:40 GMT