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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 core) or graded-index.$(iii)$ Optical fibres exhibit extremely low transmission loss.$(iv)$ Optical fibres are immune to electromagnetic interference because they transmit light signals, not electrical signals. Therefore, they are not affected by stray electric or magnetic fields.Thus, the statement that optical fibres are subjected to electromagnetic interference is false.

Column-$I$	Column-$II$
$(a)$ Proliferative Phase	$(i)$ Breakdown of endometrial lining
$(b)$ Secretory Phase	$(ii)$ Follicular phase
$(c)$ Menstruation	$(iii)$ Luteal Phase

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

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Column-$I$ Column-$II$

$(a)$ Proliferative Phase $(i)$ Breakdown of endometrial lining

$(b)$ Secretory Phase $(ii)$ Follicular phase

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