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Fresnel Lens 150x150mm, Focal Length 140mm, Acrylic Lens (not Glass), for Solar Heating, Magnifiying, Optics/Visual Education sold2026 Smead’s Erasable SuperTab File FoldersFresnel Lens 150x150mm, Focal Length 140mm, Acrylic Lens (not Glass), for Solar Heating, Magnifiying, Optics Visual Education Size: 150x150mm, Focal length 140mm, Thickness: 2mm Material: PMMA (acrylic) Groove pitch: 0. 5mm Transmission (%): 92 (from 400 1100nm) Index of Refraction nd : 1. 491 Operating Temperature (C): 80 (Maximum) Product Features 1 Pack Square Fresnel Lens Magnifier 150x150mm, Focal length 140mm, Thickness: 2mm, Material: PMMA