Definition of Focal distance of a telescope. Meaning of Focal distance of a telescope. Synonyms of Focal distance of a telescope

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Definition of Focal distance of a telescope

Focal distance of a telescope
Focal Fo"cal, a. [Cf. F. focal. See Focus.] Belonging to,or concerning, a focus; as, a focal point. Focal distance, or length, of a lens or mirror (Opt.), the distance of the focus from the surface of the lens or mirror, or more exactly, in the case of a lens, from its optical center. Focal distance of a telescope, the distance of the image of an object from the object glass.

Meaning of Focal distance of a telescope from wikipedia

- special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively...
- A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image...
- An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified...
- reflectors, the Ritchey–Chrétien telescope (RCT) has a very short optical tube ****embly and compact design for a given focal length. The RCT offers good off-axis...
- the focal length of the eyepiece is shorter or the focal length of the objective is longer. For example, a 25 mm eyepiece in a telescope with a 1200 mm...
- use of a micrometer at the focal plane (to determine the angular size and/or distance between objects observed). Huygens built an aerial telescope for...
- that its focal distance is equal to its diameter. Because it has such a short focal length, a Gregorian design could be emplo**** which uses a concave secondary...
- which makes a small object appear as a much larger image at a comfortable distance for viewing. A microscope is similar in layout to a telescope except that...
- The Giant Magellan Telescope (Giant Magellan or GMT) is a 25.4-meter, ground-based, extremely large telescope under construction at Las Campanas Observatory...
- focal length in this case). If an object is placed at a distance S1 > f from a positive lens of focal length f, we will find an image at a distance S2...