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

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

1-Pack Round Fresnel Lens Magnifier, size:Φ100mm, 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, Optical education, VR field Professional and practical design with beautiful appearance, easy to carry and use Optical education: The special structure of the Fresnel lens can adjust the parallel light or the focused light, so that the light is effectively directed to a specific narrow area to achieve the focusing effect of light. The children were curious about it.This is not only a base, but also a knowledge point that children need to learn. The working principle of Fresnel lens is mainly to use the special structure of the lens to achieve the focus of light 1) Fresnel lenses are concentric circles on the front and smooth surfaces on the back, with a regular thickness of 2mm and edges as thick as the center (not convex anywhere, not convex lenses!!) 2) Fresnel lens and convex lens are the same in function, but the two shapes are completely different, please pay attention to the distinction