For a beam focused at infinity, the far-field region is sometimes referred to as the "Fraunhofer region". Other synonyms are "far field", "far zone", and "radiation field". Any electromagnetic radiation consists of an electric field component and a magnetic field component . In the far field, the relationship between the electric field component and the magnetic component is that characteristic of any freely propagating wave, where and have equal magnitudes at any point in space (where measured in units where [[speed of light|).