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. The velocity of light in the core of a step index fiber is 2.01 × 108 m s-1,
and the critical angle at the core-cladding interface is 80°. Determine the
numerical aperture and the acceptance angle for the fiber in air, assuming it
has a core diameter suitable for consideration by ray analysis. The velocity of
light in a vacuum is 2.998 x 103 m s-1

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