AYCDL Parallel Laser Three Lines Semiconductor Light Source Concave and Convex Magnetic Lens

*Optical lenses have different shapes, which can better help students learn and understand how to find the principle of light convergence in a concrete and obvious way. Scope of application: suitable for optical class presentations and student experiences in middle and high school. *These double convex lenses are made of acrylic material, which has high durability and long-term use as a teaching tool. Magnetic attraction semiconductor three-line light source is powered by 2 x 7 dry batteries *These physical optical lenses are well polished and have different shapes with a smooth appearance that will not hurt your hands when you use them, you can use them with confidence. With an independent switch design, each light source can be switched on or off individually. *This optical lens is lightweight and small in size, easy to carry and store, and you will feel its great convenience. Material: Acrylic, Iron Boron Magnet; Weight: about 350g *This optical physics teaching tool is a good tool for students learning the properties of light. The packaging box adopts positioning packaging, which is convenient for storage and effectively avoids wear of lenses.