Description This product is a double convex lens, made of high-grade glass, reliable, and built to last. This convex lens guarantees practicality through high performance. It's the perfect accessory for science experiments, suitable for science experiments and classroom presentations. Nicegift for students and teachers who love physics and optics. Features -Material: Glass -Color: Transparent -Diameter: 3 cm / 1.18 inch -Focal Length: 5 cm / 1.97 inch -Double convex lens: The biconvex lens is used to demonstrate optical principles and effects, perfect accessory for scientific experiments. -Theoretical principle: Made according to the principle of refraction of light, it's thicker in the center and thinner at the edge. -Glass material: Made of polished glass with smooth edges, realistic surface, and clear vision, convenient to use. -Extensive use: As an experimental prop in physics classrooms, used for experimental display, optical research, etc. -Science education gift: This lenticular lens is a practical science and education gift for students and teachers who love physics and optics.Package list: 1 x Double Convex Lens