Basics - What is the Fresnel lens used in infrared sensors? - | Basics | Murata Manufacturing Co., Ltd.
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What does focal length mean for a Fresnel lighthouse lens? Is it the distance between the lamp and the lens? - Quora
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Magnifier 350mm Big Dia Solar Fresnel Lens Optical PMMA Focal Length 185mm 900mm Solar Concentrator Large Magnifying Glass 1PC (Color : 1PC Diameter : Other) Baifantastic : Amazon.co.uk: Stationery & Office Supplies
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