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

Optical Telescope

Definition: Optical Telescope

Optical Telescope

Noun

1. An astronomical telescope designed to collect and record light from cosmic sources.

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


Crosswords: Optical Telescope

English words defined with "optical telescope": coelostat ♦ Erector ♦ Line of collimation ♦ Perspicil ♦ reflecting telescope, reflector, refracting telescope. (references)
Specialty definitions using "optical telescope": double stars ♦ Fincham coincidence optometer ♦ parallactic angle ♦ tilting level. (references)

Top     

Specialty Definition: Optical telescope

(From Wikipedia, the free Encyclopedia)

An optical telescope is a telescope which is used to gather, and focus, light, for directly viewing a magnified image, making a photograph, etc. The term is used especially for a monocular with static mounting for observing the sky. Handheld binoculars are common for other purposes.

Telescopes are sometimes referred to as "photon buckets" as they are used to "collect streams of photons". There are two primary types of optical telescope: reflectors (which use mirrors) and refractors (which use lenses).

The basic scheme is that the primary light-gathering element, called the "objective lens", focuses light to a focal plane where it forms a bright virtual image. An "eyepiece" then magnifies the virtual image. Many types of telescopes fold the optical path with secondary or tertiary mirrors, usually to make the telescope more compact and reduce the width of its field of view.

Angular Resolution

An optical telescope's angular resolution is determined primarily by the width of the objective, termed its "aperture." Recently, it has become practical to perform aperture synthesis with optical telescopes. Increasingly, high-resolution optical telescopes are actually groups of widely-spaced smaller telescopes, linked together by carefully-controlled optical paths. The sensitivity of a telescope is determined by both the area of its objective, and the sensitivity of the sensor.

F-Ratio

The f-ratio of a telescope denotes how wide an angle the telescope can view. Low f-ratios indicate wide fields of view. Wide-field telescopes are used to track satellites and asteroids, for cosmic-ray research, and for surveys of the sky.

Light-Gathering Power

The light-gathering power of an optical telescope is directly related to the diameter of the objective lens or mirror. Note that the area of a circle is proportional to the square of the diameter. A telescope with a lens which has a diameter three times that of another will have nine times the light-gathering power. Larger objectives gather more light, and more sensitive imaging equipment can produce better images from less light.

Research Telescopes

Nearly all large research-grade astronomical telescopes are reflectors. Some reasons are: The size of optical telescopes increased steadily in the early 20th century culminating in the 200-inch telescope at Palomar Observatory which was built in 1948. From then until the 1980s, only one larger telescope was built.

In the 1980's a number of technological improvements were made which created a new generation of telescopes. These advances included the creation of multi-mirror telescopes and the invention of cheap personal computers which could control the mirrors. Another major advanced was the invention of rotating furnaces in which centrifugal force would shape a telescope mirror to close to its final shape.

Names of types:

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

Top     

Commercial Usage: Optical Telescope

DomainTitle

Books

  • Identification, optimization, and protection of optical telescope sites : proceedings of an International Conference held at Flagstaff, Arizona, U.S.A., May 22-23, 1986 (reference)

    (more book examples)

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

Top     

Frequency of Internet Keywords: Optical 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

optical telescope

11
Source: compiled by the editor from various references; see credits.

Top     

Modern Translations: Optical Telescope

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

French

  

télescope optique d'alignement (alignment optical telescope). (various references)

   

Pig Latin

  

opticalay elescopetay

Source: compiled by the editor from various translation references.

Top     

Anagrams: Optical Telescope

Scrabble® Enable2K-Verified Anagrams

Words within the letters "a-c-c-e-e-e-i-l-l-o-o-p-p-s-t-t"

-5 letters: cappelletti, coleoptiles.

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.

Top     

Alternative Orthography: Optical Telescope


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

4F 70 74 69 63 61 6C      54 65 6C 65 73 63 6F 70 65

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

    

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

01001111 01110000 01110100 01101001 01100011 01100001 01101100 00100000 01010100 01100101 01101100 01100101 01110011 01100011 01101111 01110000 01100101

HTML Code (1990) (references)

&#79 &#112 &#116 &#105 &#99 &#97 &#108 &#32 &#84 &#101 &#108 &#101 &#115 &#99 &#111 &#112 &#101

ISO 10646 (1991-1993) (references)

004F 0070 0074 0069 0063 0061 006C      0054 0065 006C 0065 0073 0063 006F 0070 0065

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

498286756967782547178718569818271

Top     

 

INDEX

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


  

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

 

 

 

 

Note to the press & webmasters - this dictionary can be linked, indexed, or referred to using the following non-English expressions:
woordeboek, fjalor, ‏معجم, ‏قاموس, diccionariu, речник, diccionari, diksyonario, diksinario, 字典, gérlyver, slovník, ordbog, woordenboek, shimiyuc p'anca, orðabók, orðbók, dictionnaire, wurdboek, wörterbuch, λεξικό, אוצר מילים, szótár, uqausiit tukingit, dizionario, 字引 , じい, じびき, じて", ディクショナリー , じり", じしょ, '"かい, ディクショナリ , 사 , dizionari, recnik, fockleyr, dikshonario, słownik, dicionário, dicţionar, dicziunari, словарь, lolomi fefiloi, foclair, abardair, faclair, briathrachan, pukuntau, leksikon, rečnik, vocabbulariu, diccionario, sí-chazamagâma, ordbok, lexikon, พจนานุกรม, sözlük, ansiklopedik sözlük, словник, довідник, có tính chất sách vở, geirlyfr, geiriadur, for dictionary;
definisie, qartësi, përcaktim, saktësi, ‏الوضوحية في الشيء, ‏حد, ‏تحديد, ‏تعريف, ‏التحديد, ‏الإيضاحية, яснота, сила, очертания, дефиниция, 定義 , 定义, definice, deskriptordefinition, definitie, määritelmä, définition, ορισμός, "'"ר", "'בל", meghatározás, definíció, definizione, 確定 , ディーゼル電気車 , デ'ドロ酢酸 , デフィニション , ディフィニション , ていぎ, かくてい, 의, geyrid, meenaghey, keeayllaght, baght, definishon, definição, definiţie, determinare, definire, определение, definicija, definición, definition, açıklama, belirleme, belirtme, kesinleştirme, tanım, tarif, seçiklik, tanımlama, чіткість, тлумачення, виразність, визначення, дефініція, ясність, чітка чутність, sự định rõ, sự định nghĩa, lời định nghĩa sự định, diffiniad, darnodiad, for definition;
vertaling, transferim, transmetim, ‏ترجمة من لغة أجنبية للغة الأم, ‏ترجمة, ‏إفتتان, транслация, огъване, превод, предаване, поддаване, тълкуване, превеждане, 翻译, překlad, oversættelse, translatie, taajuusmuutos, translaatio, traduction, oersetting, Übersetzung, μετάφραση, תור'מ ות, תר'ום, "עתק", "עתק, fordítás, traduzione, 翻訳 , へい"ういどう, やくしょ, やくしゅつ, "うどく, ほ"やく, トランスレーション , やくじゅつ, ほ"やくしょ, 번역, tradukshon, tradução, translaţie, tãlmãcire, traducere, сдвиг, трансляция, перемещение, перевод, tumačenje, traducción, översättning, tercüme, процес перекладу, переклад, пояснення, переміщення, sự dịch, sự biến th nh sự giải thích, trosiad, for translation;
Franse taal, Frans, franceze, francez, frëngjisht, frëng, frëngjishte, ‏فرنسي, ‏اللغة الفرنسية, ‏الشعب الفرنسي, gall, френски език, френски, Pranses, 法國 , 法文 , 法語 , 法语, francouzština, francouzský, franskur, franskt, ranskalainen, français, Frânsk, französisch, γάλλοσ, γαλλικόσ, γαλλική γλώσσα, γαλλίδα, צרפתי, צרפתית, francia, Fraincis, francese, フレコン化 , フランス" , 仏文 , 仏 , ふつぶ", フレンチ , フランセ , ふつ, "랑스, Perancis, Ny Frangee, Mooinjey ny Frank, frances, franses, francês, francezii, francezã, franţuzesc, franţuzeşte, французский, Falani, francuski jezik, francuski, francuzi, francés, sí-Fulentji, fransk, franska, fransızca, Fransiz, fransızca ile ilgili, fransız, fransa ile ilgili, французька мова, французький, Ffrengig, isiFulentshi, for French;