What are the characteristics of electromagnetic wave theory?

About 150 years ago, James Clerk Maxwell , an English scientist, developed a scientific theory to explain electromagnetic waves. He noticed that electrical fields and magnetic fields can couple together to form electromagnetic waves.

In his formulation of electromagnetism, Maxwell described light as a propagating wave of electric and magnetic fields . More generally, he predicted the existence of electromagnetic radiation: coupled electric and magnetic fields traveling as waves at a speed equal to the known speed of light.

The inherent characteristic of an electromagnetic wave is its frequency . Their frequencies remain unchanged but its wavelength changes when the wave travels from one medium to another. Electromagnetic wave follows the principle of superposition.