Optics · undergrad

Lens Equation

Atomic section generated from Complete Optics.

Published Apr 26, 2026 · 1 min

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For a thin lens with focal length $f$ , object distance $s$ , and image distance $s'$ , the paraxial relation is

\frac{1}{f}=\frac{1}{s}+\frac{1}{s'}.

It is the workhorse formula for elementary imaging systems.

Atomic section generated from Complete Optics.

Atomic section generated from Complete Optics.

A structured path from rays and lenses to interference, diffraction, polarization, and Gaussian beams.