Paraboloid Focus
★Exhibit Content: Parabolic reflection, geometric laws of parabolic focus, optical reflection analogized to mechanical reflection science popularization interactive experience ★Interaction: Manual ball dropping for mechanical trajectory observation interaction ★Operation: Drop the elastic ball vertically through the small hole at the top center of the transparent cover. The ball falls freely and hits the parabolic base at the bottom. Observe how the ball rebounds and accurately hits the bell hanging at the top. Repeat multiple times to verify the law. ★Exhibit Description: "Parabolic Focus" is a circular tabletop science exhibit that integrates analytic geometry and reflection laws, and is a recommended exhibit by KexMall. The exhibit features a white and blue circular floor-standing operation table with a yellow sealing rubber ring at the center. Above it is a cylindrical high-transparency acrylic dustproof protective cover. Inside, the bottom is a standard rotating parabolic base, and a metal bell hangs at the center of the top of the protective cover. It comes with elastic experimental balls and a science explanation sign. When the ball falls parallel to the symmetry axis of the paraboloid and hits the curved surface, all rebound trajectories converge to the focus of the paraboloid (the bell's position), visually analogizing the optical property of parallel light rays reflecting off a paraboloid and converging at the focus, transforming abstract geometric reflection laws into intuitive mechanical collision phenomena. ★Scientific Principle: 1. Geometric definition: A paraboloid is formed by rotating numerous parabolas with the same focus and directrix around the symmetry axis; all incident light rays parallel to the symmetry axis, after reflection off the paraboloid surface, must all converge at the unique focus of the paraboloid. 2. Mechanical analogy: The trajectory of a ball falling vertically is equivalent to an incident light ray parallel to the symmetry axis. The ball collides elastically with the parabolic base, and the collision reflection law is exactly the same as specular reflection of light. Therefore, after rebounding, all balls converge at the focus and accurately hit the bell hanging at the focus; this principle is widely used in searchlights, satellite antennas, solar concentrators, and other equipment.
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- Φ1.0×1.2m Φ1.0×1.2mDimensions (Diameter × Height): Φ1.0×1.2m Brand: KexMall Model: PopsciCat-math-083 1. Materials ① Circular exhibit stand: frame 2mm cold-rolled steel plate, enclosure 2.0mm cold-rolled steel plate with two-tone baked paint, overall rounded corners without sharp edges ② Tabletop: Kelesi artificial stone, thickness ≥12mm, with flame-retardant and moisture-proof bottom board underneath ③ Explanation sign: 5mm acrylic UV high-definition printing ④ Maintenance opening: 2.0mm cold-rolled plate with lock circular inspection cover ⑤ Protective cover: colored + high-transparency acrylic material, smooth edges, stable structure, dustproof protection of internal structure ⑥ Parabolic base: integrally molded smooth ABS parabolic surface, elastic and wear-resistant, ensuring standard reflection trajectory of the ball ⑦ Experimental accessories: high-elastic solid elastic balls, metal hanging bell, yellow sealing silicone sealing ring 2. Main Configuration ① Circular weighted load-bearing operation table assembly ② Standard rotating parabolic reflection base ③ Cylindrical transparent acrylic dustproof protective cover ④ Focus hanging metal bell assembly 3. Installation Requirements ① Energy requirement: No external power supply needed, pure manual ball dropping mechanical interaction, no electrical energy consumption ② Installation foundation: Circular operation table placed directly on the floor, the floor must be level to avoid tilting of the paraboloid affecting the experiment ③ Entry passage: Door frame dimensions (Width × Height) ≥1.2m×1.4m, continuous turning interval in passage ≥1.8m ④ Maintenance access: Not required
★Exhibit Content: Parabolic reflection, geometric laws of parabolic focus, optical reflection analogized to mechanical reflection science popularization interactive experience ★Interaction: Manual ball dropping for mechanical trajectory observation interaction ★Operation: Drop the elastic ball vertically through the small hole at the top center of the transparent cover. The ball falls freely and hits the parabolic base at the bottom. Observe how the ball rebounds and accurately hits the bell hanging at the top. Repeat multiple times to verify the law. ★Exhibit Description: "Parabolic Focus" is a circular tabletop science exhibit that integrates analytic geometry and reflection laws, and is a recommended exhibit by KexMall. The exhibit features a white and blue circular floor-standing operation table with a yellow sealing rubber ring at the center. Above it is a cylindrical high-transparency acrylic dustproof protective cover. Inside, the bottom is a standard rotating parabolic base, and a metal bell hangs at the center of the top of the protective cover. It comes with elastic experimental balls and a science explanation sign. When the ball falls parallel to the symmetry axis of the paraboloid and hits the curved surface, all rebound trajectories converge to the focus of the paraboloid (the bell's position), visually analogizing the optical property of parallel light rays reflecting off a paraboloid and converging at the focus, transforming abstract geometric reflection laws into intuitive mechanical collision phenomena. ★Scientific Principle: 1. Geometric definition: A paraboloid is formed by rotating numerous parabolas with the same focus and directrix around the symmetry axis; all incident light rays parallel to the symmetry axis, after reflection off the paraboloid surface, must all converge at the unique focus of the paraboloid. 2. Mechanical analogy: The trajectory of a ball falling vertically is equivalent to an incident light ray parallel to the symmetry axis. The ball collides elastically with the parabolic base, and the collision reflection law is exactly the same as specular reflection of light. Therefore, after rebounding, all balls converge at the focus and accurately hit the bell hanging at the focus; this principle is widely used in searchlights, satellite antennas, solar concentrators, and other equipment.
Review
Principle Display: ★★★★ Interaction Effect: ★★★★ Ease of Installation: ★★★★★ Durability: ★★★★ Overall Rating: ★★★★★