1. Practical Learning: Science experiment kit provides a practical opportunity for middle school physics students to learn about optics. By working with concave and convex lenses and lasers, students can personally observe and explore the phenomenon of light refraction, deepening their understanding of physical optics. 2. Easy Operation: Physical teaching tools includes tools such as concave and convex lenses, three-way lasers, assembly guides, and experiment instructions. These tools are user-friendly, allowing students to easily conduct experiments and obtain clear and reliable results. 3. Versatile Design: Lens imaging equipment tools covers optical components, including concave and convex lenses. By adjusting and combining these components, students can observe phenomena such as light refraction and focusing, expanding the diversity and depth of experiments. 4. Intuitive Teaching: When using refraction optical experiment set, by observing the refracted paths and spot forms of lasers on different lenses, students can intuitively understand the propagation laws and principles of light. 5. Improved Experimental Skills: Geometric optics experimental set enables students to become familiar with and master basic skills for optical experimentsThrough repeated experimentation and debugging, students can improve their experimental skills and observation analysis abilities. Power supply : Two No. 7 batteries (not included) Note: The color of the accessories is random and not specified. Please read carefully before purchasing. It contains small accessories and objects, and children should be accompanied by adults to complete it. Please of children and avoid swallowing. Colour:Photo Color Material:plastic Package Contents: 2 x Lens Imaging Equipment Tools set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.