Science teachers and photography enthusiasts, this 20mm K9 optical glass prism is seriously cool for demonstrating light properties! When light passes through this crystal-clear prism, it splits into beautiful rainbow colors - it's like having a tiny piece of magic in your hands. The K9 optical glass provides excellent clarity and light transmission for sharp, vibrant color separation. Perfect for classroom demonstrations about light refraction, spectrum analysis, or just creating gorgeous rainbow effects for photography. The cabin house shape makes it easy to handle and position for experiments. Great for physics lessons, homeschool science projects, or as a decorative piece that creates rainbows on your walls when sunlight hits it. Just remember - this is for educational and decorative use only, not for professional optical equipment like projectors or cameras. Watching light bend and separate through this prism never gets old, whether you're a student learning about physics or an adult who appreciates beautiful light effects. The quality construction ensures it will last through years of demonstrations and experiments.