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Question

In optical fibre,which of the following principles is used?

A
scattering
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B
refraction
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C
successive reflections
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D
total internal reflection
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Solution

The correct option is D total internal reflection
An optical fibre is based on the principle of Total Internal Reflection.
When, a light ray enters into the optical fibre, it suffers multiple total internal reflection from the side surface and emerges from the other end without any loss of energy.
Optical fibres are generally made of glass or plastic having high refractive index and coated with a substance of lower refractive index.

Hence, the correct answer is OPTION D.

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