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.
Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because
Asked in UPSC NDA 2 2019 · Topic: Optics (Fiber Optics: Principles and applications)
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Answer: D. successive total internal reflections occur as a ray moves through the fibre.
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