STUDY OF OPTICAL FIBER AND ITS USES
Dr. Satyendra Kumar
Physics
November 2023
Optical fiber is a device based on total internal reflection with the help of which the light signal can be carried over short or long distances through a crooked path with the same intensity. What is optical fiber? Where is it used and why is it used? Cosmic fiber is made up of very long and thousands of fine fibers of high quality glass or quartz. The diameter of each fiber is approximately 0⋅0001 cm and the refractive index is 1⋅7. These fibers are coated with a thin layer of material with refractive index 1⋅5. When light is incident at a small angle at one end, it hits the inside of the fiber. The value of refraction angle is greater than the critical angle of the fiber with respect to the layer. Therefore, there is repeated internal reflection of light from the interface of the thin layer and the layer. As a result, in the end the light comes out with the same intensity as the other. Uses - (i) It is used as a light tube in medical and optical testing. With the help of optical fibers, the internal parts of the lungs and other parts of the body, which cannot be seen directly, are studied. (ii) They can be used for transmission of optical signals
© Airo Journals 2021
