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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 profile can be step-index (homogeneous) or graded-index.$(iii)$ Optical fibres have extremely low transmission loss compared to copper cables.$(iv)$ Since optical fibres transmit light signals, they are immune to electromagnetic interference from external electric or magnetic fields.Therefore, the statement that optical fibres are subjected to electromagnetic interference is false.

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

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