Definition, Meaning & Synonyms

principal-axis

noun

/ˈprɪnsəpəl ˈæksɪs/

Definition

The principal axis is a line along which an object, such as a lens or a mirror, has its geometric or optical features aligned. This line plays a crucial role in defining how light or forces interact with the object.

Examples

The principal axis of the lens determines how light is focused.
In the study of dynamics, the principal axis of rotation is identified to simplify the calculations of motion.
Engineers design mirrors with a principal axis to ensure optimal reflection characteristics.

Meaning

In optics, the principal axis is essential for understanding how light rays behave when they encounter reflective or refractive surfaces. In physics, it can refer to the main axis about which an object rotates or is symmetrically arranged.