Which one of the following communication media uses light pulses for carrying information?

Optic fibre (or optical fiber) is a communication medium that transmits information as light pulses through strands of glass or plastic. It operates on the principle of Total Internal Reflection, where light signals bounce off the inner walls of the fiber core to travel long distances with minimal loss.

• Coaxial cable uses electrical signals transmitted over copper wires.
• Microwave and Satellite communications use electromagnetic radio waves (specifically in the microwave frequency range) transmitted through the atmosphere or space, rather than light pulses through a physical cable.

Optical fibers are preferred for modern high-speed internet and telecommunications because they offer significantly higher bandwidth, faster data transfer rates, and are immune to electromagnetic interference compared to traditional metal wires.