Question: For total internal reflection to occur inside an optic fiber
For total internal reflection to occur inside an optic fiber as shown in Fig. 22.29, the angle u must be greater than the critical angle for the fiber–air interface. At the end of the fiber, the incident light undergoes a refraction to enter the fiber. If total internal reflection is to occur for any angle of incidence (θi) outside the end of the fiber, what is the minimum index of refraction of the fiber?
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