Check the listing for details. 1"/2"/4" Triangular Prism Set, 3 Pcs Glass Optical Crystal Rainbow Prism, Clear. Condition: New. Listed at 20.27 USD. A triangular prism is a tool used to split white light into its spectral colors, showing the principle of distribute. It is suitable for use in physics experiments, teaching, photography, and more.SpecificationColor: TransparentMaterial: GlassLength Size 1: 25mm / 1 inchLength Size 2: 50mm / 2 inchLength Size 3: 100mm / 4 inchSide Width: 30mm / 1.18 inchPacking List: 3 x Triple Prism (Each Size for 1pcs.)AdvantageMade of quality optical glass for superior clarity and precision, it is durable and practical for use. Moreover, it is compact, and convenient for you to carry it outside photography.Triangular shape design that reflects light, splits white light into colors and produces a beautiful rainbow effect.InstructionStep1. Place the triangular prism on a flat surface with one of its faces down.Step2.