English: 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.
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Photographed and uploaded by me.
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Jack LaRosa
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((Information |Description=((en|1=View of Fresnel lens window cover used on passive infrared motion detector. Lit from behind by a point light source)) |Source=Photographed and uploaded by me. |Author=Jack LaRosa |Date=07-26-08 |Permission= |other_version
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