akuma Posted April 21, 2016 Report Share Posted April 21, 2016 Hello, everyone! I am really struggling with trying to understand the explanation given to this particular problem in the image I've attached. I more or less got the first half of it (although I am not sure what is meant by a ray "escaping"), but what really puzzles me is how a critical angle and a refractive angle can be complementary. Or does anyone have any alternative explanations to offer, perhaps? Thank you so much in advance! Reply Link to post Share on other sites More sharing options...
kw0573 Posted April 21, 2016 Report Share Posted April 21, 2016 (edited) "escape" refers to the ray that would refracts rather than total internally reflects, for incident angle from inside the fibre < c. c + r = 90° only in this setup of variables. Here r refers to refracted angle at ANOTHER normal, not the same one as the "escape" ray so the relationship holds only in context of this question. Edited April 21, 2016 by kw0573 1 Reply Link to post Share on other sites More sharing options...
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