Copyright © Philip M. Parker, INSEAD. Terms of Use.

Refracting Telescope

Definition: Refracting Telescope

Refracting Telescope

Noun

1. Optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece.

Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.
 



Specialty Definitions: Refracting Telescope

DomainDefinitions

Aerospace

A telescope which collects light by means of a lens or system of lenses. Also called refractor. (references)

Source: compiled by the editor from various references; see credits.

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Specialty Definition: Refracting telescope

(From Wikipedia, the free Encyclopedia)


The 50 centimeters refractor at Nice Observatory.
A refracting telescope (refractor) is a telescope which uses lenses to refract light. This refraction causes parallel light rays to converge at a focal point; while those which were not parallel converge upon a focal plane. This can enable a user to view a distant object as if it were brighter, clearer, and/or larger. These are similar to microscopes. The monocular is a type of refractor. A typical refractor has two lenses, an objective lens and an eyepiece lens. The objective lens has two pieces of glass (with different densities), "crown" and "flint glass". Each side of each piece is ground and polisheded, and then the two pieces are glued together. The curvatures are designed to cancel chromatic and spherical aberration.

Technical Difficulties

For research purposes, refracting telescopes have become unpopular. They are criticized for their relatively high-degree of chromatic and spherical aberration. There is also the problem of lens sagging, a result of gravity affecting glass. There is a further problem of mis-refraction; caused by air bubbles trapped within the lenses. In addition, glass is opaque to certain wavelengths, and even visible light is dimmed when it passes through glass. Many of these problems are avoided by using reflecting telescopes.

Notable Refracting Telescopes

See also:

From Refractor telescope to be merged :

A refractor telescope is a type of optical telescope that refracts light through a pair of lenses on either end of the telescope. While initially the most common type of telescope, these are today used primarily by amateur astronomers, and have been supplanted in professional work by reflecting telescopes. However, some relatively small instruments with 100-150mm objective lenses regularly produce astrophotography that rivals images created by professionals as recently as 20 years ago using what were then the largest telescopes on Earth.

See also: List of largest optical refracting telescopes (from which it is clear that their heydey was in the 19th century)

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Refracting telescope."

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Crosswords: Refracting Telescope

English words defined with "refracting telescope": field glassGalilean telescope, Galileo, Galileo Galilei, glassRefractorspyglass. (references)

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Commercial Usage: Refracting Telescope

DomainTitle

High Tech

Source: compiled by the editor from various references; see credits.

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Image Slideshow: Refracting Telescope

Illustrations:
Refracting Telescope

More images...

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Frequency of Internet Keywords: Refracting Telescope

The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.
 
ExpressionFrequency
per Day

refracting telescope

23

reflecting refracting telescope

2
Source: compiled by the editor from various references; see credits.

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Modern Translations: Refracting Telescope

Language Translations for "refracting telescope"; alternative meanings/domain in parentheses.

Danish

  

astronomisk kikkert. (various references)

   

Dutch

  

verrekijker (binocular, field glass, telescope). (various references)

   

Finnish

  

linssikaukoputki. (various references)

   

French

  

lunette d'approche (refractor), longues-vue, instrument dioptrique. (various references)

   

German

  

Refraktor (astronomical refracting telescope, refractor), Linsenfernrohr, Fernrohr (binocular, binoculars, field glass, glass, sighting telescope, telescope, telescope with sliding drawers for focussing), dioptrisches Fernrohr. (various references)

   

Greek 

  

διαθλαστικό τηλεσκόπιο. (various references)

   

Hungarian

  

lencsés távcső. (various references)

   

Italian

  

cannocchiale (binoculars, coal drop sleeve, drop sleeve, feed sleeve, sighting telescope, spyglass, telescope, telescopic section). (various references)

   

Japanese Kanji 

  

屈折望 鏡 . (various references)

   

Japanese Katakana 

  

くっせつぼうえ"きょう. (various references)

   

Pig Latin

  

efractingray elescopetay

   

Portuguese

  

óculo de ver ao longe, óculo (eyepiece, eye-piece, ocular, sighting telescope, spyglass, telescope). (various references)

   

Spanish

  

refractor (refractor), telescopio dióptico, anteojo de refracción, anteojo (sighting telescope, telescope). (various references)

   

Swedish

  

refraktor, astronomisk kikare. (various references)

Source: compiled by the editor from various translation references.

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Anagrams: Refracting Telescope

Scrabble® YAWL-Verified Anagrams

Words within the letters "a-c-c-e-e-e-e-f-g-i-l-n-o-p-r-r-s-t-t"

-5 letters: perfectionates.

Source: compiled by the editor from various references; see credits.

SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.

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Alternative Orthography: Refracting Telescope


Hexadecimal (or equivalents, 770AD-1900s) (references)

52 65 66 72 61 63 74 69 6E 67      54 65 6C 65 73 63 6F 70 65

Leonardo da Vinci (1452-1519; backwards) (references)

    

Binary Code (1918-1938, probably earlier) (references)

01010010 01100101 01100110 01110010 01100001 01100011 01110100 01101001 01101110 01100111 00100000 01010100 01100101 01101100 01100101 01110011 01100011 01101111 01110000 01100101

HTML Code (1990) (references)

&#82 &#101 &#102 &#114 &#97 &#99 &#116 &#105 &#110 &#103 &#32 &#84 &#101 &#108 &#101 &#115 &#99 &#111 &#112 &#101

ISO 10646 (1991-1993) (references)

0052 0065 0066 0072 0061 0063 0074 0069 006E 0067      0054 0065 006C 0065 0073 0063 006F 0070 0065

Encryption (beginner's substitution cypher): (references)

527172846769867580732547178718569818271

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INDEX

1. Definition
2. Crosswords
3. Usage: Commercial
4. Images: Slideshow
5. Expressions: Internet
6. Translations: Modern
7. Anagrams
8. Orthography
9. Bibliography


  

Copyright © Philip M. Parker, INSEAD. Terms of Use.