Lexic.us

Definition of Focal point

1. Noun. A point of convergence of light (or other radiation) or a point from which it diverges.

2. Noun. A central point or locus of an infection in an organism. "The focus of infection"

3. Noun. The concentration of attention or energy on something. "He had no direction in his life"

Definition of Focal point

1. Noun. (optics) A focus; a point at which rays of light or other radiation converge ¹

2. Noun. The centre of any activity ¹

3. Noun. (arts aesthetics) A feature that attracts particular attention. ¹

¹ Source: wiktionary.com

Medical Definition of Focal point

1. Location of an organism, for fish, usually the position of the snout. Habitat measurements made at that position (depth, water velocity, etc.) are focal point measurements. (09 Oct 1997)

Lexicographical Neighbors of Focal Point

focal gallbladder wall thickening focal gigantism focal glomerulonephritis focal illumination focal infection focal interval focal length focal lengths focal lymphocytic thyroiditis focal metastatic disease

focal motor seizure focal necrosis focal nephritis focal nodular hyperplasia focal plane focal point (current term) focal points focal ratio focal reaction focal sclerosing glomerulopathy

focal sclerosis focal sclerosis with hyalinosis focal segmental glomerulosclerosis focal seizure focal spot focal spot size focalisation focalise focalised focalises

Literary usage of Focal point

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences and General (1890)
"The distance of Uie fir»t principal point from the first focal point is called the anterior focal length, and the term posterior focal length is applied to ..."

2. Mirrors, Prisms and Lenses: A Text-book of Geometrical Optics by James Powell Cocke Southall (1918)
"focal point mirror (AF=FC) a convex mirror with a virtual object-point at M, ... focal point of mirror (AF = FC) concave If, on the other hand, ..."

3. Encyclopaedia Britannica: A Standard Work of Reference in Art, Literature (1907)
"Listing ш given the following measurements in millimetres from the KD¡ re of the cornea for the cardinal point« in an ideal eye : Anterior focal point- ..."

4. Manual of Petrographic Methods by Albert Johannsen (1918)
"Principal focal point.—The principal focal point of a convex lens is the point to which all parallel rays sent through it converge (F, Fig. 187). It FIG. ..."

5. Manual of Petrographic Methods by Albert Johannsen (1918)
"Principal focal point.—The principal focal point of a convex lens is the point to which all parallel rays sent through it converge (F, Fig. 187). ..."

6. The Encyclopaedia Britannica: “a” Dictionary of Arts, Sciences, Literature edited by Hugh Chisholm (1911)
"The distance of the first principal point from the first focal point is called'the anterior focal length, and the term posterior focal length is applied to ..."

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