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With reference to communication using optical fibres, which statement is incorrect?

1. Optical fibres may be designed with a graded refractive index
2. Optical fibres are affected by electromagnetic interference from external sources
3. Optical fibres exhibit very low transmission loss
4. Optical fibres can have a uniform core along with an appropriate cladding

Correct answer: Optical fibres are affected by electromagnetic interference from external sources

Solution

Optical fibres transmit data using light rather than electrical signals, making them immune to electromagnetic interference, which is a key advantage over traditional copper cables.

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