illuminating a focal point fresnel lens parabolic mirror Double the focal length part 1

	illuminating a focal point fresnel lens parabolic mirror Double the focal length part 1 See the focal point of a fresnel lens and a parabolic mirror. This is a video from 2008. Youtube allowed the rights of the original 2008 video to be stolen b...	From:GREENPOWERSCIENCE Views:7776 237ratings
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