Which phenomenon primarily enables light transmission in optical fibers?

💡 Explanation:

Total Internal Reflection (TIR) is the core principle. It occurs when light, traveling through the fiber's core (higher refractive index), strikes the boundary with the cladding (lower refractive index) at an angle greater than the critical angle, causing the light to be entirely reflected back into the core. This confines the light and allows it to travel long distances with minimal loss.