Optical fibres, though bent in any manner, allows light to pass throug

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Optical fibres, though bent in any manner, allows light to pass through. What is the inference that one can draw from it ?

The concept that light travels in straight path is wrong
Light can flow through the optical fibres
Light can travel through the fibres because of their ductility
Light can travel through the fibres due to multiple total internal reflections
This question was previously asked in
UPSC NDA-1 – 2015
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The correct answer is Light can travel through the fibres due to multiple total internal reflections. Optical fibres work based on the principle of Total Internal Reflection (TIR).
Optical fibres consist of a core (higher refractive index) surrounded by cladding (lower refractive index). Light entering the core at a suitable angle undergoes total internal reflection at the interface between the core and cladding, bouncing back into the core. This process repeats along the length of the fibre, guiding the light even when the fibre is bent, as long as the bend is not too sharp.
Option A is incorrect; light travels in straight lines in a homogeneous medium, but its path changes at interfaces or in non-homogeneous media. Option B is true but doesn’t explain the mechanism allowing travel through bends. Option C is irrelevant; ductility is a mechanical property, not an optical principle.

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