A triangular prism is a three-dimensional geometric shape that has three sides, three vertices (corners), and six faces. It is a type of polyhedron, which is a solid shape with flat faces and straight edges.

A triangular prism is formed by taking two identical triangles and connecting them along their edges. The resulting shape has two triangular faces at opposite ends, and three rectangular faces that connect the two triangular faces.

Triangular prisms are commonly used in a variety of applications, such as in geometry lessons to illustrate basic concepts of three-dimensional shapes, or in physics experiments to demonstrate the principles of reflection and refraction. They can also be used as building blocks or as decorative objects. The size of a triangular prism is typically specified by the length of its edges or the size of its triangular faces. A triangular prism with a 5cm edge length would be relatively small, with dimensions of approximately 5cm x 5cm x 5cm.

Research the refraction and dispersion of the light; see Newton's rainbow and see the quantum dynamics of light in action for yourself!