Chapter 29, Problem 27A

To determine

To Explain: The optical fibers are called light pipes. 

Explanation of Solution

Introduction: 

An optical fiber transmits light along its axis by the phenomenon of total internal reflection. Optical fiber consists of a core that is surrounded by a cladding layer. Both core and cladding are made up of dielectric materials. 

Explanation: 

Optical fiber works on the principle of total internal reflection such that the light signal can transmit from one place to another place with a minute loss of energy (negligible loss). The transmission losses are $0.1bb/km$ which is very low. 

An optical fiber is used to transmit light from one place to another place so they are called light pipes. 

The light travels in a core in a guided manner, thereby the communication through the optical fiber called as an optical waveguide. 

Conclusion: 

The optical fiber is called a light pipe because it carries light from one place to another. Also, the light transmitted in the optical fiber in a guided manner so it is also known as a waveguide.