# optical axis

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Related to optical axis: focal length, visual axis

## 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.

## 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.

## 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.

## 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
References in periodicals archive ?
Figure 8 shows the variation of the spot diameter of three bands with the position of the optical axis under a Fresnel lens for parallel incident light.
After the operator directs the optical axis of the camera to the next target point [A.sub.i+1], the value of the parameter [t.sub.i+1] is calculated using the equation (3) for the new point [P.sub.i+1] and the vector [[??].sub.i+1].
Certainly, such an absorber with the optical axis turning in accordance with the wavelength is unrealistic.
This difference in measuring the coordination of maximum fluorescence protein expression is the result of the angle of the main lobe of radiation which is not completely orthogonal to the fiber's optical axis. Taking the firing angle of 73.81[degrees] into account, we can use simple geometry to compensate for this discrepancy.
The RAC  points out that, assuming only radial lens distortion exists, the position vector [mathematical expression not reproducible] determined by the ideal image point and the distorted image point should be aligned with the position vector [mathematical expression not reproducible], which is the vertical line from the point [P.sub.W] to the optical axis, and there is a relationship between two position vectors as [mathematical expression not reproducible].
Ray matrix method has been widely used to analyze optical axis perturbations in various 3D optical systems [12-15].
In panel a) the plot with dot-lines corresponds to the phase difference calculated by subtracting the phases obtained for the opening and its complement on the optical axis for different distances of propagation; for this plot [P.sub.N] = 1.0 in Eq.
PCO development, PCO duration, need for Nd:YAG laser therapy due to optical axis obscuration and follow-up time were recorded at follow-up visits.
Locating the transmitter at the [S.sub.i] = 576 mm, the electric field distribution along the optical axis was measured by scanning the receiver axially by step of 5 mm.
This will work with the on-board system's optical axis. There are also two ways of connecting the module described in the document.
* perpendicular in the horizontal plane and the horizontal setting of the optical axis of the lens with respect to the staff (Fig.
Pikoul  provides a comparative analysis of the polarization properties of the crystal plate with a different arrangement of the optical axis. Constituent phase plates, which act as quarter- and half-wave, are often used.

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