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The principle used in the transmission of signals through an optical fibre is (a) total internal reflection (b) refraction (c) dispersion

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The principle used in the transmission of signals through an optical fibre is 

(a) total internal reflection 

(b) refraction 

(c) dispersion 

(d) interference

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(a) total internal reflection

Signals propagate through an optical fibre by suffering repeated total internal reflections.

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