nodal points


nodal points

[′nōd·əl ‚pȯins] (electricity) Junction points in a transmission system; the automatic switches and switching centers are the nodal points in automated systems. (oceanography) The no-tide points in amphidromic regions. (optics) A pair of points on the axis of an optical system such that an incident ray passing through one of them results in a parallel emergent ray passing through the other.