Note: The color of the product shipped is as shown in the first image. The specification and quantity are based on the details provided in the product title. For any requests regarding color or style changes, please within 12 hours after placing the order. Product: Physical Optical Experiment Box – Triangular Prism, Convex Lens, Concave Mirror Set for Junior High School Specifications: Product Name: Optical Experiment Box Type: Physics Teaching Instrument Material: Acrylic Weight: Approximately 435g Dimensions (L x W x H): 23.5cm x 16cm x 5cm Product Features: - Used to explore the propagation path of light. Using a laser source in a slightly dark environment, the light path in air can be clearly observed. - Homemade corner reflector: Use the two flat mirrors provided to create a corner reflector. - Homemade periscope: Use a toothpaste box (or similar cardboard container), make small openings near both ends, insert flat mirrors parallel to each other at a 45-degree angle to the horizontal plane to create a simple periscope. Package Included: 1 x Angle Dial Screen (with box) 1 x Small Sink 1 x Spherical Mirror (both sides: convex and concave) 1 x Convex Lens 1 x Concave Lens 1 x Glass Brick 1 x Triangular Prism 2 x Flat Mirrors 1 x Brown Glass Plate (Flat mirror) 3 x Chess Pieces 1 x Light Source (Three-beam laser) 1 x 30 Lenticular Lens Frame Note: Due to variations in monitor models and display settings, actual colors may differ slightly from those shown. Product dimensions are manually measured and may have a tolerance of 1–2 cm.