Question

In fibre optics, the signal source is ____________ waves.
A. Light
B. Infrared
C. Radio
D. Very low frequency

Answer 1

Hint: Fiber optics is a technology that deals with data transmission. This technology is commonly used in services such as the internet, television, and telephones. Fiber optic cables replace copper wires over numerous advantages such as higher bandwidth and transmit speeds.

Complete step by step solution:
As said fiber optics are used for data transmission and they use light pulses. These light pulses travel along with long fiber which is usually made of plastic and glass. But metal wires are usually preferred as the signals travel with fewer damages in the metal wires.
So the correct option is A.

Additional Information:
This light signal travels in the fiber-optics through the core. While traveling through the core the light signal constantly bounces from the cladding. This cladding does not absorb any light from the core. This helps the light waves to travel through greater distances. The principle behind this technology is total internal reflection.
Total internal reflection occurs when light travels in an optically dense medium hit a boundary at a steep angle, the light will be completely reflected. This steep angle will always be larger than the critical angle for the boundary.

Note:
Multimode fiber and single-mode fiber are two primary types of fiber optic cable. Single-mode fibers are used for longer distances. It has a smaller diameter of the glass fiber core, this lessens the possibility of attenuation. Attenuation is a term used for reduction in signal strength. Multimode fibers are used for shorter distances. It has a larger diameter of the glass fiber core, this permits multiple light pulses to be sent through the cable at one time resulting in more data transmission.