The index of refraction of the core of a piece of fiber, Ask an Expert

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The index of refraction of the core of a piece of fiber optic cable is 1.72. If the index of the surrounding cladding is 1.41, what is the critical angle for total internal reflection for a light ray in the core incident on the core-cladding interface?

a. 60.6°

b. 49.6°

c. 55.1°

d. 44.0°

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