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The velocity of light in the core of a s...

The velocity of light in the core of a step index fibre `2xx10^(8) m//s` and the critical angle at the core-cladding interface is `80^(@)`.Find the numerical aperture and the acceptance angle for the fibre in air.The velocity of light in vacuum is `3xx10^(8)m//s`

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The correct Answer is:
0.264,`15.3^(@)`
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