FTP, identify this optical phenomenon in which an incident angle of a light beam greater than such a critical angle will lead to a successful strategy for engineering fiber optic cables.
The Glan-Foucault polarizer and the Wollaston prism employ both birefringence and this property in order to separate the two beams of light in a crystalline material.  The critical angle necessary for the use of such an event is 48.6 degrees for a water-air boundary, which can be calculated by setting the angle of refraction equal to 90 degrees and using Snell's law.  FTP, identify this optical phenomenon in which an incident angle of a light beam greater than such a critical angle will lead to a successful strategy for engineering fiber optic cables.
The Glan-Foucault polarizer and the Wollaston prism employ both birefringence and this property in order to separate the two beams of light in a crystalline material.  
total internal reflection