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focal

Overview page. Subjects: Mathematics.

Related to, going through or measured from the focus.

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focalization

Overview page. Subjects: Literature.

The term used in modern narratology for ‘point of view’; that is, for the kind of perspective from which the events of a story are witnessed. Events observed by a traditional omniscient...

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focalization

Edited by Dinah Birch and Katy Hooper.

in The Concise Oxford Companion to English Literature

January 2012; p ublished online May 2013 .

Reference Entry. Subjects: Literary Studies (British and Irish). 146 words.

The technical term in modern *narratology for the adoption of a limited ‘point of view’ from which the events of a given story are witnessed, usually by a character within the fictional...

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focalization

Edited by Dinah Birch.

in The Oxford Companion to English Literature

January 2009; p ublished online January 2009 .

Reference Entry. Subjects: Literary Studies (British and Irish). 146 words.

The technical term in modern *narratology for the adoption of a limited ‘point of view’ from which the events of a given story are witnessed, usually by a character within the fictional...

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focal distance

Ian Ridpath.

in A Dictionary of Astronomy

January 2012; p ublished online January 2012 .

Reference Entry. Subjects: Astronomy and Astrophysics. 8 words.

An alternative name for *focal length.

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focal distance

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 9 words.

An alternative name for *focal length.

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focal length

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 48 words.

The distance between a lens or mirror and its focal point. Together with the aperture, the focal length is one of the main properties of a lens or mirror. The longer the focal length, the...

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focal reducer

Overview page. Subjects: Astronomy and Astrophysics.

A converging lens, placed just before a telescope's focal point, which has the effect of shortening the effective focal length and giving a wider field of view.

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focal reducer

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 31 words.

A converging lens, placed just before a telescope’s *focal point, which has the effect of shortening the *effective focal length...

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focal reducer

Ian Ridpath.

in A Dictionary of Astronomy

January 2012; p ublished online January 2012 .

Reference Entry. Subjects: Astronomy and Astrophysics. 29 words.

A converging lens, placed just before a telescope's *focal point, which has the effect of shortening the *

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focal ratio

Ian Ridpath.

in A Dictionary of Astronomy

January 2012; p ublished online January 2012 .

Reference Entry. Subjects: Astronomy and Astrophysics. 64 words.

The ratio of the *focal length of a lens or mirror to its aperture, usually expressed as a number,

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focal ratio

Edited by Ian Ridpath.

in A Dictionary of Astronomy

P ublished online February 2018 .

Reference Entry. Subjects: Astronomy and Astrophysics; Astronomical Instrumentation, Methods, and Techniques; Galaxies. 69 words.

The ratio of the *focal length of a lens or mirror to its aperture, usually expressed as a number, the ...

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focal length

Daniel Chandler and Rod Munday.

in A Dictionary of Media and Communication

January 2011; p ublished online January 2011 .

Reference Entry. Subjects: Media Studies. 225 words.

In *optics, the distance from the middle of the lens to its focal point. Light rays run in

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focal length

Daniel Chandler and Rod Munday.

in A Dictionary of Media and Communication

P ublished online March 2016 .

Reference Entry. Subjects: Media Studies. 225 words.

In optics, the distance from the middle of the lens to its focal point. Light rays run in parallel to

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focal length

in World Encyclopedia

P ublished online January 2004 .

Reference Entry. Subjects: General Studies. 39 words.

Distance from the midpoint of a curved mirror or the centre of a thin lens to the focal point of

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focal ratio

Overview page. Subjects: Astronomy and Astrophysics.

The ratio of the focal length of a lens or mirror to its aperture, usually expressed as a number, the f/number. The smaller the focal ratio, the smaller the image scale and the brighter the...

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focal plane

Overview page. Subjects: Astronomy and Astrophysics.

A flat surface at right angles to the optical axis of a lens or mirror which contains the image of a small, distant object and also the focal point. If an extended image lies not in a plane...

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Focal epilepsy

Tim Wehner, Kanjana Unnwongse and Beate Diehl.

in Oxford Textbook of Clinical Neurophysiology

November 2016; p ublished online December 2016 .

Chapter. Subjects: Clinical Medicine; Neurology. 9865 words.

This chapter examines the neurophysiology of focal epilepsy. It discusses the principles of EEG source localization. This is followed by a presentation of nonspecific and epileptiform...

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focal colour

Overview page. Subjects: Psychology.

A colour that is a prototypical instance of a particular colour name, such as a shade of red that a majority of viewers consider to be the best example of a red colour. US focal color.

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Focal abnormalities

Nicola Sverzellati, Gianluca Milanese and Mario Silva.

in The ESC Textbook of Cardiovascular Medicine

December 2018; p ublished online July 2018 .

Chapter. Subjects: Cardiovascular Medicine. 2172 words.

Both the detection and interpretation of focal abnormalities on chest X-ray (CXR) are challenging tasks. CXR accuracy depends on the view (e.g. the supine view has limited sensitivity) and...

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focal length

Overview page. Subjects: Media Studies.

In optics, the distance from the middle of the lens to its focal point. Light rays run in parallel to one another, while lenses distort light rays: a convex lens (the type that is thicker...

See overview in Oxford Index