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#16
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![]() "WingFlaps" wrote in message oups.com... On Nov 13, 3:42 pm, Mxsmanic wrote: The beam of a good quality laser (highly collimated, that is) will hardly spread out at all over a distance of a few thousand feet and thus may still be only a millimetre or two in diameter. Complete ********. Just buy a laser pointer and measure the spot size after 50'. It's already cm wide. The cavity of laser diode is just too short to produce such high degree of collimation... Garden-variety laser pointers aren't the same as the newer high-powered green lasers, though, are they? (For example: http://www.greenlaserbeam.com/ ) -c not a physicist. |
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