Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
the holes through the fibre are extremely fine.
light rays are absorbed at the entry end and relieved at the exit end of the fibre.
scattering of light occurs inside the fibre.
successive total internal reflections occur as a ray moves through the fibre.
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2019
Optical fibres work on the principle of Total Internal Reflection (TIR). The fibre consists of a core with a higher refractive index surrounded by cladding with a lower refractive index. Light entering the core at suitable angles strikes the core-cladding interface at angles greater than the critical angle, causing the light to be reflected back into the core. This process repeats along the length of the fibre, guiding the light even if the fibre is bent.