Photo 1 of Fresnel Lens, Diameter 100mm (4''), Focal Length 140mm, Acrylic Ultrathin Lens for Physics Classroom, Solar Heating, (Focal Length 140mm)

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Photo 1 of Fresnel Lens, Diameter 100mm (4''), Focal Length 140mm, Acrylic Ultrathin Lens for Physics Classroom, Solar Heating, (Focal Length 140mm)Photo 2 of Fresnel Lens, Diameter 100mm (4''), Focal Length 140mm, Acrylic Ultrathin Lens for Physics Classroom, Solar Heating, (Focal Length 140mm)