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Jun 18, 2014 at 23:40 history edited Kevin Kostlan CC BY-SA 3.0
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Jun 18, 2014 at 18:42 vote accept baister
Jun 18, 2014 at 18:10 comment added dmckee --- ex-moderator kitten I don't need to tell you this, but also don't feel the following comment deserves its own post, so here goes: it might help in thinking about this to recall that the microscopic origin of the ray theory is wrapped up in Huygen's principle and depends on waves being able to propagate in all directions. The boundary conditions imposed by the confines of the fiber prevent propagation in most direction so Huygen's principle does not apply and you can't recover geometric optics.
Jun 18, 2014 at 16:21 history answered Kevin Kostlan CC BY-SA 3.0