An optical fiber is a long transparent cylinder of
Chapter 32, Problem 32.83(choose chapter or problem)
An optical fiber is a long transparent cylinder of diameter dand index of refraction n. If this fiber is bent sharply, somelight hitting the side of the cylinder may escape rather thanreflect back into the fiber (Fig. 32-65). What is the smallestradius r at a short bentsection for which totalinternal reflection will beassured for light initiallytravelling parallel to theaxis of the fiber?FIGURE 32-65 83
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