Paraxial

Paraxial
The rays nearest the optical axis of a lens.
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Paraxial (Gaussian) optics is assumed, and technically, the formulas are valid only for rays that are infinitesimally close to the lens axis.

Paraxial - rays nearest the optical axis of a lens.
PCT - see Photo color transfer.
PEC - see Photo-electric cell.

An optical image distortion conditional on the varying distance of paraxial light rays of the same wavelength from the optic axis.