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At λ0 = 820 nm the absorption loss of a fibre is 0.25 dB/km and the scattering loss is 2.25 dB/km. If the fibre is used instead at λ0 = 600 nm, and calorimetric measurements of the heat generated by light absorption give a loss of 2 dB/km, estimate the total attenuation at λ0 = 600 nm.

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