| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,771,487,063 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
Gregorian telescope |
Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia, Hutchinson | 0.04 sec. |
|
Gregorian telescope [grə′gȯr·ē·ən ′tel·ə‚skōp] (optics) A reflecting telescope having a paraboloidal mirror with a hole in the center and a small secondary (concave ellipsoidal) mirror placed beyond the focus of the primary mirror; light is reflected to the secondary mirror and back to an eyepiece at the hole; the telescope produces an erect image but a small field of view. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| ? Mentioned in | ? References in periodicals archive | |
|---|---|---|
The result is a Compact Gregorian Telescope that can be as short as 1/7th the focal length of the system. |
| Encyclopedia |
| Free Tools: |
For surfers:
Free toolbar & extensions |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|