telescope flint

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• flint glass — Optics. an optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens. [1665 75] * * * …   Universalium

• Achromatic telescope — The achromatic telescope is a refracting telescope that uses an achromatic lens to correct for chromatic aberration. How it worksWhen an image passes through a lens, the light is diffracted at different angles for different wavelengths. This… …   Wikipedia

• 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

• Refracting telescope — A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such… …   Wikipedia

• Craig telescope — Location Wandsworth Common, London, Wavelength Visible light Built 1852 First light 1852 T …   Wikipedia

• Achromatic telescope — Achromatic Ach ro*mat ic, a. [Gr. ? colorless; a priv. + ?, ?, color: cf. F. achromatique.] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [1913 Webster] 2. (Biol.) Uncolored; not absorbing color… …   The Collaborative International Dictionary of English

• LUNETTES ASTRONOMIQUES ET TÉLESCOPES — Sous l’appellation un peu désuète de «lunettes astronomiques» se rangent une série d’instruments d’importance historique considérable: c’est grâce, en effet, à la lunette de Galilée (fig. 1) que la conception du monde a évolué du géocentrisme… …   Encyclopédie Universelle

• Optical aberration — v · d · e Optical aberration …   Wikipedia

• technology, history of — Introduction       the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …   Universalium

• Australian National University — The Australian National University Coat of Arms of ANU Motto Naturam Primum Cognoscere Rerum ( First to learn the nature of things ) Established 1946 …   Wikipedia

• Michigan State University — Motto …   Wikipedia