Description: Upgraded Model: The junior high school physics optics experiment kit is a brand new upgraded model, suitable for students who are interested in exploring optical principlesComprehensive Content: The physics optics experiment kits covers Plane mirror imaging, light reflection and refraction, lens imaging rules, Rectilinear propagation of light and convex and concave lens imaging rulesTeaching Aids: This physical light reflection demonstration model is an teaching aid in the classroom. It helps students effectively understand the principle of light refractionMaterials: Optical experiment tool made of quality materials, it is smooth and burr freely and sturdy. The kit is easy to assemble and does not require any additional accessoriesPractical Science Kit: This physical optics experiment science kits is simple and practical, suitable for classroom assignments Size Chart: 59.5cmx18cmx11cm/23.43inchx7.09inchx4.33inch Package Includes: 1Physics Optics Experiment Kits Note: 1.This is not infant toy , please take away from children to avoid eating.2.Please allow slightly errors 1-2cm differences due to manual measurement.