refracting system
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refractive system — noun : an optical system in which lenses instead of mirrors are used for focusing light, forming an image, or changing the path of a beam of light by refraction; specifically : a mode of lighting in lighthouses by a central lamp surrounded by a… … Useful english dictionary
dioptric system — a system of lenses or of different media for refracting light … Medical dictionary
telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… … Universalium
Mohammad Ataul Karim — Born May 4, 1953 (1953 05 04) (age 58) Sylhet, Bangladesh Citizenship Bangladesh / USA … Wikipedia
Axis — The axis is the second cervical vertebra (symbol: C2). It is called the axis because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of C2. The joint between the axis and atlas is a pivot type of joint. It… … Medical dictionary
optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… … Universalium
photoreception — photoreceptive, adj. /foh toh ri sep sheuhn/, n. the physiological perception of light. [1905 10; PHOTO + RECEPTION] * * * Biological responses to stimulation by light, most often referring to the mechanism of vision. In one celled organisms such … Universalium
History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… … Wikipedia
Optical telescope — Eight Inch refracting telescope (Chabot Space and Science Center) An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for… … Wikipedia
Optical aberration — v · d · e Optical aberration … Wikipedia
