Principal Axis
Definition
The principal axis is an imaginary line that passes through the center of a lens or mirror and is perpendicular to its surface.
Analogy
Think of the principal axis as the central highway that runs straight through the middle of a city, connecting all the important locations. Just like how the principal axis connects different parts of a lens or mirror.
Related terms
Focal Point: The point on the principal axis where parallel rays converge or appear to diverge from.
Optical Center: The point on the principal axis where light rays pass through without any deviation.
Aperture: The opening through which light enters or exits a lens or mirror.
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