Faraday Phenomenon
— the rotation of the polarization plane of linearly polarized electromagnetic waves with its spreading in the material along magnetic field lines. The angle of rotation $\varphi$ of the polarization plane even $\varphi=V l H$, where $H$ — value of the tension magnetic field, $l$ — length of the path that passes electromagnetic wave field, $V$ — constant of Verde’s, which depends on the nature of the substance, wavelength and temperature. Opened in $1846$ Michael Faraday.