'Electro-magnetic theory of light' definitions:

Definition of 'Electro-magnetic theory of light'

From: GCIDE

Electro-magnetic \E*lec`tro-mag*net"ic\, a. Of or pertaining to electromagnetism. [1913 Webster]
Electro-magnetic engine, an engine in which the motive force is electro-magnetism.
Electro-magnetic theory of light (Physics), a theory of light which makes it consist in the rapid alternation of transient electric currents moving transversely to the direction of the ray. [1913 Webster]