100 mm Diameter Optical Plastic Fresnel Lens A large, lightweight Fresnel lens designed for solar concentration and handson optics learning. This plastic optical lens delivers strong light focusing in a compact, affordable form factor, making it practical for classroom demonstrations, hobby projects, and basic solar experiments. Key benefits Efficient light concentration: The Fresnel groove pattern focuses sunlight and other light sources to a tight spot, enabling visible heating effects and clear focal demonstrations. Large working area: 100 mm diameter provides a bigger capture surface than small lenses, increasing collected light and improving performance for experiments and concentrator projects. Lightweight and durable: Made from opticalgrade plastic for easy handling and safer classroom use compared to glass lenses. Flexible performance options: Available in multiple focal length choices to match project needs, from short focal distance intensity to longer focal distance lower intensity. Specifications Type: Fresnel lens, optical plastic Diameter: 100 mm Available focal lengths (length options): 36 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 100 mm, 120 mm Selected configuration for this listing: Color 40mm, Size 100mm What makes it practical Simple to mount or clamp into experimental rigs and optics kits Compatible with educational optics modules, DIY solar concentrators, and projection setups Cost effective alternative to large glass lenses for demonstrations and prototyping Suggested applications Science classroom demonstration: Show focal point behavior, lens imaging, and ray tracing in physics lessons using the selected 40 mm focal length and 100 mm diameter for visible results. Solar concentration experiments: Use to concentrate sunlight onto a small receiver for temperature measurements, material heating demonstrations, or basic solar thermal experiments. Optics and hobby projects: Incorporate into kaleidoscope builds, prism experiments, small projection rigs, or prototype solar cookers and steam generators. Usage tips Position lens at the appropriate focal distance from the target to achieve a sharp focal spot for results. Secure the lens in a stable holder to maintain alignment during experiments. Choose focal length based on required spot size and working distance: shorter focal lengths produce smaller, more intense spots; longer focal lengths give larger, more forgiving focal zones. This Fresnel lens provides a straightforward, reliable option for educators, hobbyists, and experimenters needing a large, plastic optical lens with selectable focal length options and consistent focusing behavior.