TIA's Glossary of Telecommunication Terms
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refracted ray
1. A ray that undergoes a change of velocity, or in the general case, both velocity and direction, as a result of interaction with the material medium in which it travels. 2. In an optical fiber, a ray that is refracted from the core into the cladding. Specifically a ray having direction such that 
where r is the radial distance from the fiber axis, 
(r ) is the azimuthal angle of projection of the ray at r on the transverse plane, 
(r ) is the angle the ray makes with the fiber axis, n (r ) is the refractive index at r , n (a ) is the refractive index at the core radius, a . Refracted rays correspond to radiation modes in the terminology of mode descriptors.