Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Focus_(optics)> ?p ?o }
- Focus_(optics) abstract "In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics. In the absence of significant aberrations, the smallest possible blur circle is the Airy disc, which is caused by diffraction from the optical system's aperture. Aberrations tend to get worse as the aperture diameter increases, while the Airy circle is smallest for large apertures.An image, or image point or region, is in focus if light from object points is converged almost as much as possible in the image, and out of focus if light is not well converged. The border between these is sometimes defined using a circle of confusion criterion.A principal focus or focal point is a special focus:For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal points—one on each side. The distance in air from the lens or mirror's principal plane to the focus is called the focal length.Elliptical mirrors have two focal points: light that passes through one of these before striking the mirror is reflected such that it passes through the other.The focus of a hyperbolic mirror is either of two points which have the property that light from one is reflected as if it came from the other.Diverging (negative) lenses and convex mirrors do not focus a collimated beam to a point. Instead, the focus is the point from which the light appears to be emanating, after it travels through the lens or reflects from the mirror. A convex parabolic mirror will reflect a beam of collimated light to make it appear as if it were radiating from the focal point, or conversely, reflect rays directed toward the focus as a collimated beam. A convex elliptical mirror will reflect light directed towards one focus as if it were radiating from the other focus, both of which are behind the mirror. A convex hyperbolic mirror will reflect rays emanating from the focal point in front of the mirror as if they were emanating from the focal point behind the mirror. Conversely, it can focus rays directed at the focal point that is behind the mirror towards the focal point that is in front of the mirror as in a Cassegrain telescope.".
- Focus_(optics) thumbnail Focusing_on_retina.svg?width=300.
- Focus_(optics) wikiPageID "1032610".
- Focus_(optics) wikiPageLength "3967".
- Focus_(optics) wikiPageOutDegree "38".
- Focus_(optics) wikiPageRevisionID "686448590".
- Focus_(optics) wikiPageWikiLink Airy_disk.
- Focus_(optics) wikiPageWikiLink Aperture.
- Focus_(optics) wikiPageWikiLink Autofocus.
- Focus_(optics) wikiPageWikiLink Bokeh.
- Focus_(optics) wikiPageWikiLink Cardinal_point_(optics).
- Focus_(optics) wikiPageWikiLink Cassegrain_reflector.
- Focus_(optics) wikiPageWikiLink Category:Geometrical_optics.
- Focus_(optics) wikiPageWikiLink Category:Science_of_photography.
- Focus_(optics) wikiPageWikiLink Circle_of_confusion.
- Focus_(optics) wikiPageWikiLink Collimated_light.
- Focus_(optics) wikiPageWikiLink Curved_mirror.
- Focus_(optics) wikiPageWikiLink Defocus_aberration.
- Focus_(optics) wikiPageWikiLink Depth_of_field.
- Focus_(optics) wikiPageWikiLink Depth_of_focus.
- Focus_(optics) wikiPageWikiLink Diffraction.
- Focus_(optics) wikiPageWikiLink Ellipse.
- Focus_(optics) wikiPageWikiLink Far_point.
- Focus_(optics) wikiPageWikiLink File:Glasses_800_edit.png.
- Focus_(optics) wikiPageWikiLink Fixed-focus_lens.
- Focus_(optics) wikiPageWikiLink Focal_length.
- Focus_(optics) wikiPageWikiLink Focus_(geometry).
- Focus_(optics) wikiPageWikiLink Focus_stacking.
- Focus_(optics) wikiPageWikiLink Geometrical_optics.
- Focus_(optics) wikiPageWikiLink Hyperbola.
- Focus_(optics) wikiPageWikiLink Lens_(optics).
- Focus_(optics) wikiPageWikiLink Mirror.
- Focus_(optics) wikiPageWikiLink Optical_aberration.
- Focus_(optics) wikiPageWikiLink Parabola.
- Focus_(optics) wikiPageWikiLink Ray_(optics).
- Focus_(optics) wikiPageWikiLink Sphere.
- Focus_(optics) wikiPageWikiLink File:DOF-ShallowDepthofField.jpg.
- Focus_(optics) wikiPageWikiLink File:Focusing_on_retina.svg.
- Focus_(optics) wikiPageWikiLinkText "''Focal Point''".
- Focus_(optics) wikiPageWikiLinkText "''focus''".
- Focus_(optics) wikiPageWikiLinkText "Blurry".
- Focus_(optics) wikiPageWikiLinkText "Focal Point".
- Focus_(optics) wikiPageWikiLinkText "Focal point".
- Focus_(optics) wikiPageWikiLinkText "Focus (optics)".
- Focus_(optics) wikiPageWikiLinkText "Focus".
- Focus_(optics) wikiPageWikiLinkText "Focusing".
- Focus_(optics) wikiPageWikiLinkText "blur".
- Focus_(optics) wikiPageWikiLinkText "blurred".
- Focus_(optics) wikiPageWikiLinkText "blurring".
- Focus_(optics) wikiPageWikiLinkText "camera focus".
- Focus_(optics) wikiPageWikiLinkText "fixation point".
- Focus_(optics) wikiPageWikiLinkText "focal distance".
- Focus_(optics) wikiPageWikiLinkText "focal line".
- Focus_(optics) wikiPageWikiLinkText "focal plane".
- Focus_(optics) wikiPageWikiLinkText "focal point".
- Focus_(optics) wikiPageWikiLinkText "focal points".
- Focus_(optics) wikiPageWikiLinkText "focal region".
- Focus_(optics) wikiPageWikiLinkText "focal".
- Focus_(optics) wikiPageWikiLinkText "foci".
- Focus_(optics) wikiPageWikiLinkText "focus (optics)".
- Focus_(optics) wikiPageWikiLinkText "focus point".
- Focus_(optics) wikiPageWikiLinkText "focus".
- Focus_(optics) wikiPageWikiLinkText "focused".
- Focus_(optics) wikiPageWikiLinkText "focuser".
- Focus_(optics) wikiPageWikiLinkText "focuses".
- Focus_(optics) wikiPageWikiLinkText "focusing".
- Focus_(optics) wikiPageWikiLinkText "fuzzy".
- Focus_(optics) wikiPageWikiLinkText "in focus".
- Focus_(optics) wikiPageWikiLinkText "optical focusing".
- Focus_(optics) wikiPageWikiLinkText "point of focus".
- Focus_(optics) wikiPageWikiLinkText "prime focus".
- Focus_(optics) wikiPageWikiLinkText "principal foci".
- Focus_(optics) wikiPageWikiLinkText "refocused".
- Focus_(optics) wikiPageWikiLinkText "refocusing".
- Focus_(optics) wikiPageWikiLinkText "underfocus".
- Focus_(optics) wikiPageWikiLinkText "visual focus".
- Focus_(optics) wikiPageWikiLinkText "zoom".
- Focus_(optics) wikiPageUsesTemplate Template:For.
- Focus_(optics) wikiPageUsesTemplate Template:Refimprove.
- Focus_(optics) subject Category:Geometrical_optics.
- Focus_(optics) subject Category:Science_of_photography.
- Focus_(optics) hypernym Point.
- Focus_(optics) type Place.
- Focus_(optics) type Concept.
- Focus_(optics) type Physic.
- Focus_(optics) comment "In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics. In the absence of significant aberrations, the smallest possible blur circle is the Airy disc, which is caused by diffraction from the optical system's aperture.".
- Focus_(optics) label "Focus (optics)".
- Focus_(optics) sameAs Q190909.
- Focus_(optics) sameAs Fokus.
- Focus_(optics) sameAs بؤرة_العدسة.
- Focus_(optics) sameAs Фокус,_фізіка.
- Focus_(optics) sameAs Фокус_(оптика).
- Focus_(optics) sameAs Fokus.
- Focus_(optics) sameAs Focus_(òptica).
- Focus_(optics) sameAs Fokus.
- Focus_(optics) sameAs Fokuso_(optiko).
- Focus_(optics) sameAs Foco_(óptica).
- Focus_(optics) sameAs Fookus.
- Focus_(optics) sameAs کانون_عدسی.
- Focus_(optics) sameAs Polttopiste.