paraxial image
31aberration — aberrational, adj. /ab euh ray sheuhn/, n. 1. the act of departing from the right, normal, or usual course. 2. the act of deviating from the ordinary, usual, or normal type. 3. deviation from truth or moral rectitude. 4. mental irregularity or… …
32Abbe sine condition — The Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off axis as well as on axis objects. It was formulated by Ernst Abbe in the context of microscopes.The… …
33Numerical aperture — The numerical aperture with respect to a point P depends on the half angle θ of the maximum cone of light that can enter or exit the lens. In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes… …
34Thin lens — In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the focal length of the lens. Lenses whose thickness is not negligible are sometimes called… …
35Gain (lasers) — Gain (or amplification) in laser physics is a process, where the medium transfers part of its energy to the emitted electromagnetic radiation, resulting in an increase in laser power. This is basic principle of all lasers.Quantitatively, the… …
36Prenatal development — This article is about prenatal development of human embryos and fetuses. For other species, see prenatal development (non human). For maternal changes in the prenatal period, see Maternal physiological changes in pregnancy. Prenatal or antenatal… …
37para- — 1. para ♦ Élément, du gr. para « à côté de ». para 2. para ♦ Élément, tiré de mots empruntés (parasol, paravent) qui exprime l idée de « protection contre » (cf. Pare , 2. parer). ● para Préfixe, du grec para, à côté de, entrant dans la… …
38Parabola — For other uses, see Parabola (disambiguation). A parabola …
39List of optical topics — Probably some Wikipedia articles on topics in optics are not yet listed on this page. If you cannot find the topic you are interested in on this page, the article may nonetheless exist; you can try to find it using the Search box, or look in and… …
40Small-angle approximation — is a useful simplification of the laws of trigonometry which is only approximately true for finite angles, but correct in the limit as the angle approaches zero. It involves linearization of the trigonometric functions (truncation of their Taylor …
