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...
- mirror; at either of two Nasmyth focal points in enclosures on the sides of the telescope mount, to which light can be directed with a tertiary mirror;...
- The VISTA (Visible and Infrared Survey Telescope for Astronomy) is a wide-field reflecting telescope with a 4.1 metre mirror, located at the Paranal Observatory...
- C****egrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the...
- to a spot (known as the focal point) at a distance f from the lens. Conversely, a point source of light placed at the focal point is converted into a collimated...