The eikonal and other approximation methods used to describe light scattering are compared with the exact theory for long absorbing fibres. Fibre diameters in the range 0.2 - 4.0 μm are considered. The real and imaginary refractive index values considered are 1.05, 1.10, 1.15 and 0.001, 0.01, 0.1, 1.0 respectively. The implications of these results to fibre sizing are discussed.
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