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 ?
where (i, j) is the axial point and radial point of the mesh system; see Figure 2.
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.
For the special case of axial points of observation (x = 0) the angle [chi] defined by Eq.