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On Sep 11, 2:55*pm, Richard Clark wrote:
On Thu, 11 Sep 2008 09:38:46 -0700 (PDT), Art Unwin wrote: On Sep 11, 10:37*am, Richard Clark wrote: On Thu, 11 Sep 2008 06:18:14 -0700 (PDT), Art Unwin wrote: If I have a flash light that is focussed does this wavelength aproach still apply? The reflector (or magnifier lens, take your pick) is on order of at least 1 centimeter. *The light wavelength is on order of 500 nanometers. Ratio = 20,000:1 Beam is generally no narrower than 15 degrees. *At a distance of, say, 6 feet, that beam would cover a diameter of 18 inches. *Nothing like a Lazer (sic) if that is the goal. I see no basis for the inclusion of wavelengths when one is not using a straight radiator Read your own question. *There is no such thing as a "straight radiator" of light. *There is everything to do with wavelength or you could never see light. 73's Richard Clark, KB7QHC If you say so and are comfortable with that then stick with it ! My thoughts are with the reflector and it's design |
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