What is a common application of optical fibers in technology?

Optical fibers are primarily used for transmitting data as light signals, which allows for incredibly fast and efficient communication. The fundamental principle behind this application is known as total internal reflection, where light signals are transmitted through the fiber's core, which reflects the light along the length of the fiber without significant loss. This method of transmitting data using light signals enables high-speed internet and telecommunications, providing a backbone for modern digital communication.

The other applications mentioned—such as magnifying distant objects, focusing images onto a screen, or filtering specific colors of light—are not appropriate for optical fibers. Instead, these functions are typically associated with lenses, projectors, and filters in optical systems, illustrating how different optical devices serve unique purposes based on their design and functionality.