nodal point

(redirected from axial point)

no·dal point

one of two points in a compound optic system so related that a ray directed toward the first point will appear to have passed through the second point parallel to its original direction.
Synonym(s): axial point
Farlex Partner Medical Dictionary © Farlex 2012

no·dal point

(nō'dăl poynt)
One of two points in a compound optic system so related that a ray directed toward the first point will appear to have passed through the second point parallel to its original direction.
Synonym(s): axial point.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

nodal point

Either of a pair of points situated on the axis of an optical system so that any incident ray sent through one will produce a parallel emergent ray sent through the other.
See also: point
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
In the case where an isotropic radiating axial point source is in the detector well-cavity at a distance, h, from cavity bottom (see Figure 1), the path of the photon is well defined by the geometrical solid angle, [OMEGA], subtended by the source-to-detector system at the point of entry.
Caption: Figure 1: Well-type detector with an isotropic radiating axial point source in the detector well-cavity.
Equation (7) states that the depth dependent OCT amplitude signal is given by the inverse Fourier transform of the source spectrum, the axial point spread function (PSF), convoluted with the sample reflectivity.
The OCT axial point spread function (PSF) is given by the signal i(z) in response to a [delta]-function sample.
This exemplary study ends with a discussion of Tieck's place in literary history on the basis of Phantasus and sees this collection situated on an axial point between Romanticism and Biedermeier.
where (i, j) is the axial point and radial point of the mesh system; see Figure 2.3.
Chow's well-developed thesis brings us back to this axial point. The Confucian ethic was erected not around arguable propositions, but around ritual, which carries the values encoded within it.
His present study of the drawings at the site now prompts him to propose that the temple would have been a complete Nagara monument, with the surviving linga sanctuary surrounded by a spacious passageway, entered through doorways on four axial points, and surmounted by a lofty Bhumija-type tower.
A short review cannot dojustice to any single essay, let alone a multifaceted collection of them, so here I will only mention several connected, axial points from which much of the collection drives forward.
Osterberg and Smith (12) found a closed expression for [U.sup.(s).sub.RS] at axial points of observation behind a circular aperture and confirmed that it does represent a continuous extension of the incident field into the half space z > 0.