Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title.If you need to change the color or style, you need to contact us within 12 hours after placing the order.Our product description:Physical Optical Experiment Box Triangular Prism Convex Lens Concave Mirror Set Junior High School MSpecifications:Product Name: Optical Experiment BoxType: Physics Teaching InstrumentProduct material: AcrylicWeight: About 435gSize (L W H): 23.5cm 16cm 5cm Product Features:- Used To Explore The Propagation Path Of LightUsing a laser source, in a slightly dark space, you can clearly observe the propagation path of light in the air;- Homemade Corner ReflectorTry to make a corner reflector with the two flat mirrors provided;- Homemade PeriscopeFind a toothpaste box (or similar carton), open a small opening near the ends of the box, each with a flat mirror, two plane mirrors parallel to each other, and at an angle of 45 to the horizontal plane, to make the easiest periscope. Package Included:1 Pcs Angle Dial Screen (with box)1 Pcs Small Sink1 Pcs Spherical Mirror (Both sides are convex mirror, concave mirror)1 Pcs Convex Lens1 Pcs Concave Lens1 Pcs Glass Brick1 Pcs Triangular Prism2 Pcs Flat Mirror1 Pcs Brown Glass Plate (Flat mirror)3 Pcs Chess Pieces1 Pcs Light Source (Three-way laser source)1 Pcs 30 Lenticular Lens FrameNote: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.