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...
- the physical length of the lens is shorter than the focal length.: 93  This is achieved by incorporating a special lens group known as a telephoto group...
- 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...
- 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...
- the 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...
- usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample. The objective lens or mirror collects...
- A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits...
- A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective...
- degrees exist (see below). Their focal lengths depend on the film format they are designed for. M****-produced fisheye lenses for photography first appeared...
- or "focal length multiplier", which is a factor by which a lens focal length can be multiplied to give the full-frame-equivalent focal length for a lens...