Question

on:
fiber-optic cables are made of

answer options:
select one of four
tungsten fibers. copper fibers.
steel fibers. glass fibers.

Explanation:

Fiber - optic cables function based on the principle of total internal reflection, which requires a material with suitable optical properties. Glass fibers (usually made of silica - based glass) have the appropriate refractive index and transparency to transmit light signals over long distances, which is essential for fiber - optic communication. Tungsten is used in filaments (like in light bulbs), copper is used in electrical wires (for conducting electricity), and steel is a metal used for structural purposes, none of which are suitable for transmitting light signals in fiber - optic cables.

Answer:

D. glass fibers.