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.
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This is the latest accepted revision, reviewed on 14 March 2017. Stephenie Meyer (nÃ©e Morgan; /ËmaÉª.Ér/; born December 24, 1973) is an American young adult fiction writer and film producer, best known for her vampire romance series Twilight. The Twilight novels have gained worldwide recognition and sold over 100 million copies, with translations into 37 different languages.