Description This optical science experiment kit features a water filling lens design, making it ideal for interactive optics teaching equipment and laboratory lessons. Its precise lens imaging experiment capability clearly demonstrates light refraction and focal length measurement tools, enhancing student engagement in physical optics experiment kit activities. materials allow reliability in frequent classroom use. Features -Color:Assorted Color -Material:Plastic - Size: 21.00X8.00X4.00cm/8.25X3.14X1.57in -Precision optics: laboratorygrade optics experiment kit delivers imaging, allowing students to observe physical optics phenomena with exceptional clarity and accuracy in classroom experiments -Flexible lens adjustment: unique variablefocus concave lens imaging kit enables effortless focal length measurement and setup for experiments, accommodating various teaching scenarios for optimal learning -Intuitive refraction demonstration: waterbased optical lens experiment kit provides an engaging light refraction teaching equipment, making refraction demonstration kits easy to understand and explore in science classes -Stable structure: constructed from robust materials, the optical science experiment supplies withstands repeated student use, making it a reliable educational physics tool for frequent lessons and hands-on activities -Simple assembly and use: designed for quick installation, the physical experiment teaching demonstration equipment supports both school laboratory and home science education, providing versatile ease of use for learners of all agesPackage list: 1 x set of lens and bracket