Description: Optical glass lens, laboratory optical bench accessory Science experiment - exploring optical property, Early physics science educational toy for kids children student Student pupil teaching Aids?the fun of the lenses learning science knowledge kid science development toys, a series of physical science boarden kids and children horizon, stimulating their curiosity Material: Optical Glass, Plastic Frame Color?As picture show Size Chart: Concave Lens Diameter: 30mm Focal Length: -50mm Handle length : 12.5cm/ 4.92 inch Package Includes: 1 piece Optical Glasses Len Toy Note: Please allow 1-3mm error due to manual measurement, make sure that you do not mind before you bid. Due to the different monitor and light effect, the actual color may be slightly different from the picture color
