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Fresnel Lens Magnifier, Diameter 100mm (4''), Focal Length 100mm, Acrylic Lens (Not Glass), for Physics Classroom,Solar Heating,Magnifiying. (Focal

Fresnel Lens, Diameter 200mm (7.9''), Focal Length 100mm, Acrylic Lens (not Glass), for Physics Classroom,Solar Heating,Magnifiying. (Focal Length 100mm) : Industrial & Scientific