Prism, a transparent object surrounded by two intersecting planes that are not parallel to each other, used for splitting or dispersing light beams. Prism is a polyhedron made of transparent materials (such as glass, crystal, etc.). It is widely used in optical instruments. Prisms can be divided into several types according to their properties and uses. For example, in spectral instruments, the "dispersion prism" that decomposes the composite light into spectrum is more commonly used as equilateral prism.

A prism is a transparent body with a triangular cross section. It is an optical instrument with triangular cross section made of transparent material. It belongs to a kind of dispersion prism, which can make polychromatic light disperse when passing through the prism. A prism is a triangular cylinder formed by the intersection of the planes of a transparent glass body. Generally, the main section is a triangle, and its structure is divided into surface, edge, top angle, bottom, bottom and top line.

Source: @witaminat