In a prism, what is the edge of maximum surface separation opposite the apex called?

The edge of maximum surface separation opposite the apex of a prism is called the base. In geometric terms, a prism is a solid object with two parallel, congruent faces (the bases) and other faces that are parallelograms, connecting corresponding vertices of the bases. The apex is the top point of the prism, while the vertex refers to the corners of the prism where two edges meet. The edge represents the line segment where two faces intersect. The base specifically identifies the edge opposite the apex as it denotes where the maximum surface area is found in relation to the top point of the prism. Understanding these definitions is crucial in optics, as they relate to how prisms refract light and the overall design in optical instruments.