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Describe the numerical aperture in the optical fibre.
Numerical Aperture:
The numerical aperture is described as the sine of the acceptance angle. Therefore,
Numerical Aperture (NA) = sin θ0 = (√(n21 - n22))/n0
Numerical aperture is a measure of the amount of light which can be accepted through a fibre. When the light ray launching zone is air medium, n0=1 then,
Numerical Aperture (NA) = sin θ0 = √(n21 - n22)
After that, the numerical aperture depends only onto the refractive index of the core and the cladding. Value ranges of this from 0.13 to 0.50. A huge numerical aperture means that a fibre will accept huge amount of light by the source.
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