Vertex (V)

Definition

The vertex refers to either one of two points on an optical element such as a lens or mirror where the principal axis intersects with it. In lenses, there is one vertex for each surface; in mirrors, there is only one vertex.

Related terms

Optical Element: Any device that manipulates light, such as lenses and mirrors.

Curvature: The amount of bending in a lens or mirror surface.

Refraction:

The bending of light as it passes from one medium to another.