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Historic (1995) Giant Fresnel Lens Page ... When I was a kid, I always wanted Edmund Scientific's Giant Fresnel Lens. "Melts asphalt in seconds!" the ad said. When I went to graduate school I met several other people with the same enthusiasm for aimless destruction through bizarre means, and just enough combined cash to...
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www-personal.umich.edu/~bclee/lens.html
www-personal.umich.edu/~bclee/lens.html
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Fresnel lens - Wikipedia, the free encyclopedia
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A Fresnel lens (pronounced /freɪˈnɛl/ fray-NELL) is a type of lens developed by French physicist Augustin-Jean Fresnel for lighthouses; a similar design had previously been proposed by Buffon and Co...
en.wikipedia.org/wiki/Fresnel_lens
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Buy Fresnel Lens, linear Polarizer, circular Fresnel lenses, Polarizer film, LCD polarizer, polarizers from manufacturer at low wholesale price ... The Fresnel lens was invented by French physicist Augustine Fresnel, the Augustin Fresnel first used this lens design to build a glass Fresnel lens - lighthouse lens in 1822.
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www.3dlens.com/
www.3dlens.com/
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If you have ever looked at the lens of a magnifying glass, you know that it is thick in the middle and tapers down to nothing at the edges. In other words, it is shaped like a lentil, which is where the word lens comes from. It would not be...
http://science.howstuffworks.com/question244.htm
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The Fresnel lens was much more efficient at collecting and directing the light rays and produced a beam five times more powerful than the reflector system used previously. But, to take maximum advantage of the higher light intensity, the light had to be placed high enough to compensate for the curvature of the earth.
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www.lanternroom.com/misc/freslens.htm
www.lanternroom.com/misc/freslens.htm
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Tests showed that while an open flame lost nearly 97% of its light, and a flame with reflectors behind it still lost 83% of its light, the fresnel lens was able to capture all but 17% of its light. Because of its amazing efficiency, a fresnel lens could easily throw its light 20 or more miles to the horizon.
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www.lighthousegetaway.com/lights/fresnel.html
www.lighthousegetaway.com/lights/fresnel.html
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Achromatic combinations of a diffractive phase Fresnel lens and a refractive correcting element have been proposed for x-ray and gamma-ray astronomy and for microlithography, but considerations of absorption often dictate that the refractive component be given a stepped profile, resulting in a double Fresnel lens.
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www.medscape.com/medline/abstract/15449471
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Perturbative chirped pulse excitation leads to oscillations of the excited state amplitude. ... By direct analogy with Fresnel zone lenses, we then conceive highly phase-amplitude modulated pulse shapes that slice destructive interferences out of the excitation time structure and enhance the final population.
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www.medscape.com/medline/abstract/12443475
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