Question: 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 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 (Î¸i) outside the end of the fiber, what is the minimum index of refraction of the fiber?

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