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Discussion

Optical fibre transmits light using the principle of ________.

  • A.diffraction
  • B.total internal reflection
  • C.refraction through a prism
  • D.polarisation

Answer: A

Correct answer: total internal reflection

The core has a higher refractive index than the cladding, so light striking the boundary beyond the critical angle is reflected entirely back into the core. Repeating this along the length carries the signal with very little loss.

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