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| View Original: | Fresnel only.JPG (420x336) | |||
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| Keywords: Fresnel only.JPG en Front view of Fresnel-lens cover used on window of typical passive infrared motion detector Illuminated from behind by a single point light source Each spot of light is one of 18 Fresnel lenses Photographed and uploaded by me Jack LaRosa 07-26-08 PIR Passive infrared sensor Fresnel lenses Motion detectors | ||||
