Pick out the correct statements about optical fibres from the following :
S1 : Optical fibres are used for the transmission of optical signals only.
S2 : Optical fibres are used for transmitting and receiving electrical signals.
S3 : The intensity of light signals sent through optical fibres suffer very small loss.
S4 : Optical fibres effectively employ the principle of multiple total internal reflections.
S5 : Optical fibres are glass fibres coated with a thin layer of a material with lower refractive index.

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S1 and S2

S2 and S3

S3 and S4

S2, S3, S4 and S5

answer is D.

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Detailed Solution

Optical fibres are glass fibres coated with a material of lower refractive index at the outer layer so that light under goes total internal reflection. These are used to transmit and receive signals at very high speeds and the loss of light intensity is limited since the reflections are total internal reflections.

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