Which of the following optical phenomena is primarily responsible for the propagation of light signals through an optical fiber?

💡 Solution & Explanation

Optical fibers rely entirely on the principle of Total Internal Reflection, occurring when a light beam strikes the boundary of the core and cladding at an angle exceeding the critical angle, ensuring zero transmission loss. Refraction involves the bending of light across medium boundaries rather than complete confinement, while diffraction and scattering cause dispersion rather than guided propagation.