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A length of 6000 km of fiber-optic cable is laid to connect New York to London. If

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A length of 6000 km of fiber-optic cable is laid to connect New York to London. If the core of the cable has a refractive index of 1.48 and the cladding has a refractive index of 1.45, what is the time needed for a beam of photons introduced at 0° in New York to reach London? Assume that  dispersion effects can be neglected for this calculation. What is the maximum angle of incidence at which there is no leakage of light from the core?

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