Description: Educational Tool: Physics Optical Experiment Set is designed to clearly demonstrate the phenomenon that light changes its propagation direction when it moves from 1 medium to another, causes refraction at the of different media, and the phenomenon that light returns to its original direction in the material when it propagates to different materialsMaterial: Refraction and Reflection of Light is made of pp, ensuring long term use and wear resistanceCompact Size: Convex Lens and Small Hole Imaging Experiment's packaging size is 13cmx9cmx4cm, which is compact and easy to store or carry, suitable for classroom demonstrations or learning coursesPackage Contents: Each package comes with a complete Teaching Demonstration Equipment that provides all the necessary components for a comprehensive physical optics experimentVersatile Use: Teaching Aid is an teaching aid for secondary school physics education, making complex optical principles easy to understand through hands on experiments Size Chart: Packing size: 13cmx9cmx4cm/5.12inchx3.54inchx1.57inch Package Includes: 1 Physics Optical Experiment Set 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.