Three-Wire Semiconductor Light Source Magnetically Absorbing Concave Lens Parallel Three-line Semiconductor Light Source Magnetic Concave and Convex

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*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 junior and high school optical classroom presentations and student experiments. *These double convex lenses are made of acrylic material, which has high durability and supports long-term use as a teaching tool. The magnetically attracted semiconductor three-line light source is powered by 2 x 7 dry batteries *These physical optics lenses are well polished and have different shapes with a smooth which will not hurt your hands when you use them, you can use them with confidence. With independent switch design, each light source can be turned on or off individually. *This optic lens is light in weight 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 both students learning the properties of light teachers.The packaging box adopts positioning packaging, which is convenient for storage and effectively avoids lens wear.