Optical fibre works on the principle of
- total internal reflection
- refraction
- scattering
- interference
Explanation
Option (a) is correct
- Optical fibres transmit light by confining it within a high–refractive-index core surrounded by a lower-index cladding. When light strikes the core–cladding boundary at an angle greater than the critical angle, it undergoes total internal reflection and continues to travel along the fibre with minimal loss. Thus, light propagation in optical fibres occurs through repeated total internal reflection, not simple refraction or scattering.
