optical axis

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optical axis

The imaginary line passing through the midpoint of a lens, mirror, or system of such elements and on which lies the focal point of parallel paraxial rays.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Optical Axis

 

The optical axis of a lens or a concave or convex mirror is the straight line that is the axis of symmetry of the refracting surfaces of the lens or of the reflecting surface of the mirror. It passes perpendicularly through the center of these surfaces. Optical surfaces that have such an axis are said to be axially symmetric. The optical axis of an optical system is the common axis of symmetry of all the lenses and mirrors in the system.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

optical axis

[′äp·tə·kəl ′ak·səs]
(anatomy)
An imaginary straight line passing through the midpoint of the cornea (anterior pole) and the midpoint of the retina (posterior pole).
(optics)
A line passing through a radially symmetrical optical system such that rotation of the system about this line does not alter it in any detectable way.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

optical axis

An imaginary line drawn from the geometric center of a film to the center of a lens. It may project beyond the lens. Also called a lens axis and a camera axis
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
These analysis techniques can be applied on cross sections along or perpendicular to the fiber axis, and can be used to extract morphological repeat distances which correlate to crystallite and microfibril geometry.
Using these fibers as base for the production of sequentially deposited PSCs, they were able to fabricate devices displaying a much higher PCE when excited with light polarized along the fiber axis than in the direction perpendicular to the fiber axis.
In the current configuration this is modeled as a 100-[micro]m thick cut perpendicular to the fiber axis direction as shown in Fig.
However, similar high modulus type pitch-based fibers deform by a shear mechanism with kink bands formed at 45[?] to the fiber axis. Carbon fibers are very brittle.
The fiber axis is aligned according to various keys and offers improved optical integrity, reductions in loss of optical power (measured in joules or milliwatts) and support of a single polarization state.
Microbends are microscopic deviations along the fiber axis; a microbend can result if fiber is squeezed by the cable buffer or jacket material as it contracts at low temperatures.
At least a portion of the staple fibers has two flat end faces at an angle of 10 degrees or more to a plane crossing the fiber axis of the staple fiber at right angles.
They're highly oriented along the long fiber axis, and they're highly crystalline."
These include the physical and mechanical properties of the wood; the size, shape, and surface condition of the fasteners; speed of withdrawal; and orientation of fiber axis.
Morphological studies show the crystal structure is oriented radially, so the fiber has a backbone of strong covalent bonds along the fiber axis and hydrogen bonding in the radial direction.
Increasing fiber content decreases the thermal expansion in a direction parallel to the fiber axis but has little effect in the direction transverse to the fiber axis."
The refractive indices for light polarizing parallel ([n.sup.[parallel]]) and perpendicular ([n.sup.[perpendicular to]]) to the fiber axis can be determined by applying the following equation 4: