Havelock's law

Havelock's law

[′hav‚läks ‚lȯ]
(optics)
The law that in a substance displaying the Kerr effect, np -n = 2 (ns -n), where n is the index of refraction in the absence of an electric field, and np and ns are the indices of refraction of light whose magnetic vector is parallel and perpendicular to the applied electric field.