The attenuation in optical fiber is mainly due to

Absorption

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Scattering

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Neither absorption nor scattering

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Both (a) and (b)

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Solution

The correct option is D Both (a) and (b)
A very small part of light energy is lost from an optical fiber due to absorption or due to light leaving the fiber as a result of scattering of light sideways by impurities in the glass fiber.

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