Answered: The core of a 150-m long optical fiber… | bartleby

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The core of a 150-m long optical
fiber has an index of refraction n
= 1.367 while its cladding has an
index n' = 1.333. What is the
smallest angle of incidence
(measured from the normal of the
internal surface) at which light can
enter this optical fiber and remain
trapped inside it?

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