The index of refraction for the ordinary ray is constant and is independent of direction. The index of refraction for the extraordinary ray is a continuous function of direction. The index of refraction for the ordinary ray is independent of direction. The two indices of refraction are equal only in the direction of an optic axis. The measure of birefringence (Î´) [delta] is the difference between the indices of refraction of the two rays.
A preview of what LinkedIn members have to say about Rob: 1  Rob Joyce is the sort of building contractor you can trust. As development director at Mansell, he was always a pleasure to do business with, and ensured the correct people within his organisation provided us with the pre contract advice we needed.
William Brooke Joyce (24 April 1906 â 3 January 1946), nicknamed Lord Haw-Haw, was an American-born Irish-British Fascist politician and Nazi propaganda broadcaster to the United Kingdom during World War II.He was convicted of one count of High Treason in 1945.illiam Joyce was born on Herkimer Street in Brooklyn, New York, to an Anglican mother and an Irish Catholic father, Michael, who had taken United States citizenship on 25 October 1894. A few years after his birth, the family returned to Galway, Ireland.