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.
Analogy
Imagine you have two mirrors placed at an angle to each other, forming a corner. The point where the two mirrors meet is like the 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.
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