ratio of refraction
121Nepheline — General Category Silicate mineral Chemical formula (Na,K)AlSiO4 …
122History of electromagnetism — The history of electromagnetism, that is the human understanding and recorded use of electromagnetic forces, dates back over two thousand years ago, see Timeline of electromagnetism. The ancients must have been acquainted with the effects of… …
123Sarir field — Infobox Oil field name = Sarir Field country = Libya coordinates = coord|28.22|N|19.13|E|region:LY type:landmark locblock = Sirte Basin, Concession 65 offonshore = Onshore operators = flagicon|Libya Arabian Gulf Oil Company partners =… …
124On Vision and Colors — (German: Über das Sehn und die Farben) is a treatise[1] by Arthur Schopenhauer that was published in May 1816 when the author was 28 years old. Schopenhauer had extensively discussed with Johann Wolfgang von Goethe about the poet s Theory of… …
125colour — /kul euhr/, n., adj. v.t., v.i. Chiefly Brit. color. Usage. See or1. * * * I Aspect of any object that may be described in terms of hue, brightness, and saturation. It is associated with the visible wavelengths of electromagnetic radiation, which …
126telescope — /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… …
127angle — The meeting point of two lines or planes; the figure formed by the junction of two lines or planes; the space bounded on two sides by lines or planes that meet. For angles not listed below, see the descriptive term; e.g., axioincisal, distobuccal …
128Nonimaging optics — (also called anidolic optics)[1][2] is the branch of optics concerned with the optimal transfer of light radiation between a source and a target. Unlike traditional imaging optics, the techniques involved do not attempt to form an image of the… …
