The ___ of optical fiber cable reflects the light throughout the length of cable.

The core of optical fiber cable is the central part that carries the light signals. It is made of a material, typically glass or plastic, that has a higher refractive index compared to the cladding surrounding it. This difference in refractive index is crucial because it allows the light signals to be transmitted effectively through the core by means of total internal reflection. When light enters the core at a certain angle, it reflects off the boundary of the core and cladding, allowing the signal to travel over long distances without significant loss of strength. This property is what makes optical fibers suitable for high-speed data transmission.

While cladding does play an essential role in maintaining the integrity of the transmission by reflecting light back into the core, it is the core itself that is responsible for actually conducting and carrying the light signals. Other components, like the casing and buffer coating, protect the fiber but are not involved in the transmission of light itself.