Consider telecommunication through optical fibres. Among the following statements which is/are not true?

Optical fibers can be of graded refractive index.

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Optical fibers are subjected to electromagnetic interference from outside.

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Optical fibers have extremely low transmission loss.

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Optical fibers have homogeneous core with a suitable cladding.

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Solution

The correct option is B Optical fibers are subjected to electromagnetic interference from outside.
Light transmission through optical fibers is unaffected by other electromagnetic radiation nearby. The optical fiber is electrically non-conductive, so it does not act as an antenna to pick up electromagnetic signals. Information traveling inside the optical fiber is immune to electromagnetic interference, even electromagnetic pulses generated by nuclear devices.

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