Create stunning rainbows and teach light spectrum physics with this crystal prism. Features: BEAUTIFUL SPECTRUM OF COLORS: This crystal triangle prism splits a beam of light into its spectral components, displaying all the colors of the rainbow. Perfect for creating interesting photos and teaching light spectrum physics. HOW TO GET THE PERFECT RAINBOW: Achieve the perfect rainbow by finding the right angle for the light beam to hit the first surface. Best results are in low light, as the rainbow can be hard to see in bright light. Avoid working too close to a window and reflect onto an off-white wall for the best rainbow to photograph or film. Works well with professional cameras and phone cameras. CRYSTAL CLEAR GLASS FOR TEACHING: Polished and hardened for a perfectly smooth and scratch-free surface. Each prism is flawlessly made from K9 crystal glass and is completely bubble-free. Without blemishes, it's the perfect tool for teaching refraction, dispersion, and total internal reflection. Handle with care in the sun, as the crystal glass will get hot. Prism Dimensions: 150mm (15cm/6 inches) in length. Each side measures 35mm (3.5cm/1.38 inches). Total weight is 193 grams.