The amount of rotation, in radians, is given by Rmλ2, where λ is the wavelength of the radiation and Rm is a factor known as the rotation measure.
Faraday rotation is displayed by radio waves as they travel through the interstellar medium. Observing it in the radiation from pulsars is among the most important ways of studying the galactic magnetic field.
Related category OPTICS AND OPTICAL PHENOMENA
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