Feature●1-Pack Square Fresnel Lens Magnifier●150x150mm, Focal length 140mm, Thickness:2mm, Material: PMMA (Acrylic)●High Light Transmittance, High Efficiency in Focusing, High Precision.●Great for Physics Classroom Education, Solar Heating Experiment, DIY Solar Project, Magnifying, Scientific Research●Six Seasons is a Professional Manufacturer of Fresnel Lens and Optical LensDescription
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)