Definition of Focal distance or length of a lens or mirror. Meaning of Focal distance or length of a lens or mirror. Synonyms of Focal distance or length of a lens or mirror

Here you will find one or more explanations in English for the word Focal distance or length of a lens or mirror. Also in the bottom left of the page several parts of wikipedia pages related to the word Focal distance or length of a lens or mirror and, of course, Focal distance or length of a lens or mirror synonyms and on the right images related to the word Focal distance or length of a lens or mirror.

Definition of Focal distance or length of a lens or mirror

Focal distance or length of a lens or mirror
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 or length of a lens or mirror from wikipedia

- 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...
- spherical mirror can. A toroidal reflector is a form of parabolic reflector which has a different focal distance depending on the angle of the mirror. The...
- sensor or film is) has to be adjusted to this focal length. For example, given a focal length of 500 mm, the distance between lens and focal plane is...
- a wide-angle lens is a lens covering a large angle of view. Conversely, its focal length is substantially smaller than that of a normal lens for a given...
- lens is called a positive or converging lens. For a thin lens in air, the distance from the lens to the spot is the focal length of the lens, which is commonly...
- light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements. They...
- of lens. Short-focus perspective-control (PC) lenses (i.e., 17 mm through 35 mm) are used mostly in architectural photography; longer focal lengths may...
- the diameter of the objective times the focal ratio. It represents the distance at which the mirror or objective lens will cause light from a star to converge...
- at greater distances. The design allows the construction of lenses of large aperture and short focal length without the m**** and volume of material that...
- lens (F), except in macro photography where the lens-to-object distance is comparable to the focal length. In this case, the magnification factor (m) must...