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

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.

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
References in periodicals archive ?
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.
Chow's well-developed thesis brings us back to this axial point.
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.