| dioptric | <optics> Of or pertaining to the dioptre, or to the metric system of numbering glasses. A dioptre. See Dioptre. Source: Websters Dictionary (01 Mar 1998) |
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| dioptric aberration | <microscopy> A lens defect in which image forming rays passing through the outer zones of the lens focus at a distance from the principal plane, different from that of the rays passing through the centre of the lens. The aberration caused by (near-paraxial) monochromatic light rays or electron beams passing through different radii of a lens not coming to the same focus. (05 Aug 1998) |
| dioptrical | Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope. "Dioptrical principles. <geometry> " Dioptric curve, a Cartesian oval. See Cartesian. Origin: Gr. Belonging to the use of the; = through + the root of I shall see: cf. F. Dioptrique. Source: Websters Dictionary (01 Mar 1998) |
| dioptrics | <microscopy> An old term, relating to study of image formation by a lens due to refraction. It is not included in the general term, ego-metrical optics. (05 Aug 1998) |