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

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Optical fibres can be of graded refractive index

Optical fibres are subjected to electromagnetic interference from outside

Optical fibres have extremely low transmission loss

Optical fibres may have homogeneous core with a suitable cladding

answer is B.

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Detailed Solution

Some of the characteristics of an optical fiber are as follows:

(i) It consists of core made up of glass/silica/plastic with refractive index $n_{1}$ , which is surrounded by a glass or plastic cladding with refractive index $n_{2} (n_{2} < n_{1})$ . The refractive index of cladding can be either changing abruptly or gradually changing (graded index fibre).

(ii) There is a very little transmission loss through optical fibres

(iii) There is no interference from stray electric and magnetic fields to the signals through optical fibres.

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