Made from high-quality ABS material, this optical experiment kit is safe, durable, and functional. Requires 2 AAA batteries (not included). Adjustable light direction with a screwdriver. Explore various optical phenomena, including: Light refraction Convex lens refraction Prism refraction Plane mirror reflection Diffuse reflection Convex mirror reflection Concave mirror reflection And more. This physical optics experiment kit provides a fun and easy way for your child to learn about physical optics. Name: Optical Experiment Kit Color: White Material: ABS Size: 24 x 14 x 3 cm Package Includes: 1 x 3 Bi-convex lens 1 x Single concave lens 1 x Acrylic glass tile 1 x Single convex lens 1 x Double concave lens 1 x Triangular prism 1 x Triple linear 1 x Multi-functional reflector Note: The color of the object on the image may differ slightly from the actual color due to light reflection and different screens. The allowed measurement error is +/- 1-3 cm.