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(B) The characteristics of an optical fibre are as follows:$(i)$ It works on the principle of total internal reflection.$(ii)$ It consists of a core m

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Optical fibres are subjected to electromagnetic interference from outside

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(B) The characteristics of an optical fibre are as follows:$(i)$ It works on the principle of total internal reflection.$(ii)$ It consists of a core made of glass, silica, or plastic with a refractive index $n_1$, surrounded by a cladding with a refractive index $n_2$, where $n_1 > n_2$. The refractive index of the core can be uniform (step-index) or vary gradually (graded-index).$(iii)$ Optical fibres exhibit extremely low transmission loss.$(iv)$ Optical fibres are immune to electromagnetic interference from external electric and magnetic fields because they transmit light signals rather than electrical signals.Therefore, the statement that optical fibres are subjected to electromagnetic interference is $NOT$ true.

Consider telecommunication through optical fibres. Which of the following statements is $NOT$ true?

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