it is Quality Product made from 1st Quality Glass. A prism is a special piece of glass, crystal, or plastic that bends light. The light bends (or refracts) because it moves slower in the glass, crystal or plastic than it does in air. If different colors of light move at different speeds, each color bends a different amount. Prism, in optics, piece of glass or other transparent material cut with precise angles and plane faces, useful for analyzing and reflecting light. An ordinary triangular prism can separate white light into its constituent colors, called a spectrum. This kind of optical glass prism can reflect seven-color sunlight .it can teach children to explore the mysteries of light, stimulate a child's thirst for knowledge, and improve the children's interest of understanding the magic world. A Prism Is A Transparent Optical Element With Flat, Polished Surfaces That Refract Light. At Least Two Of The Flat Surfaces Must Have An Angle Between Them. The Exact Angles Between The Surfaces Depend On The Application. The Traditional Geometrical Shape Is That Of A Triangular Prism With A Triangular Base And Rectangular Sides, And In Colloquial Use "Prism" Usually Refers To This Type. Some Types Of Optical Prism Are Not In Fact In The Shape Of Geometric Prisms. Prisms Can Be Made From Any Material That Is Transparent To The Wavelengths For Which They Are Designed.