The velocity of light in the core of a step index fiber is 253005219.76 m/s, and the critical angle at the core-cladding interface is 84.6 degrees. Calculate the numerical aperture for this fiber in air. Already tried sin(84.6) but that was not the answer

The velocity of light in the core of a step index fiber is 253005219.76 m/s, and the critical angle at the core-cladding interface is 84.6 degrees. Calculate the numerical aperture for this fiber in air.

Already tried sin(84.6) but that was not the answer

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images - The velocity of light in the core of a step index fiber is 253005219.76 m/s, and the critical angle at the core-cladding interface is 84.6 degrees. Calculate the numerical aperture for this fiber in air. Already tried sin(84.6) but that was not the answer

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