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Initially scientists estimated that silica optical fibre may reach a 'low loss' attenuation of about 20 dB/km and now the lowest attenuation reached is

Initially scientists estimated that silica optical fibre may reach a 'low loss' attenuation of about 20 dB/km and now the lowest attenuation reached is about 0.158 dB/km. Work out the corresponding attenuation coefficients in 1/m. [10 marks]

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