An optical fibre has a numerical aperture of 0.2 and a cladding refractive index of 1.59. Determine the acceptance angle for the fibre in water which has a refractive index of 1.33.

An optical fibre has a numerical aperture of 0.2 and a cladding refrac

1.	An optical fibre has a numerical aperture of 0.2 and a cladding refractive index of 1.59. Determine the acceptance angle for the fibre in water which has a refractive index of 1.33.
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An optical fibre has a numerical aperture of 0.2 and a cladding refractive index of 1.59. Determine the acceptance angle for the fibre in water which has a refractive index of 1.33.​

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An optical fibre has a numerical aperture of 0.2 and a cladding refractive index of 1.59. Determine the acceptance angle for the fibre in water which has a refractive index of 1.33.