1. Primary physical optics experiment box: You can use this set of optical equipment for optical experiments and adjust different lights with your child.<br> 2. Experiments that can be done: the straight line of light, the law of light reflection, the law of light refraction, exploring the law of lens imaging, pinhole imaging, the converging effect of concave lenses on parallel s, the converging effect of convex lenses on parallel s of light, the total reflection of light, the three of light Base color.<br> 3. Features: Do experiments anytime and anywhere, learn in experiments, grow in play, and at the same time improve children's handson ability, observation ability, analytical ability, develop thinking, improve grades, stimulate interest, and enhance memory.<br> 4. There is a scale on the guide rail for easy observation and synthesis of rules. It is lighter than traditional optical tables and is easy to assemble and store.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store