KnowraParaxial approximationLinked fromLinked fromThe 11 pages that link to Paraxial approximation, each with the reason it gives.All 11Related 9Narrower topic 1Compared with 1Geometrical opticsRelated: Many simple ray equations and matrix methods rely on this restricted regime.Optical aberrationRelated: Many aberrations appear as departures from the predictions of paraxial imaging.Field of viewRelated: Simple field-of-view formulas often assume small angles and near-axis rays.Small-angle approximationRelated: It uses small-angle trigonometry to simplify ray paths and imaging equations.Fresnel diffractionRelated: It simplifies the geometry used to derive the Fresnel propagation formula.Spherical aberrationRelated: It predicts a common focus for near-axis rays, unlike the behavior of wider-aperture rays.EyepieceRelated: It provides a simple first estimate of eyepiece image formation and magnification.Focus (optics)Related: The familiar single-focus description is most accurate for paraxial rays.AutocollimatorRelated: Autocollimator angle and image-shift relations are usually derived for small deviations.