https://sciencing.com/how-does-optical-fiber-work XXXXXXXXXXhtml as reference & https://www.cableorganizer.com/fiber-optic/

Fiber Optics
1) What fiber optics is used for?
Fiber optics is used as a medium for telecommunication. It is also used as a medium in computer networking. The reason for using fiber optics in preference to others is its flexibility, and the little space it takes for storing due to its capability to put as bundles. The main advantage is that light requires lower attenuation to propagate through fibre optics compared to other similar tools, such as electric cables. Also no interference or cross talk and also higher bandwidth.
2) How fiber optics uses light?
Light travels down a fiber-optic cable made of corres and wrapped by coatings. The light hits the wall and gets bounced and the process repeats again and again. The total internal reflection is used. When light travels through a glass pipe it hits glass at a lower angle (say 45 deg) which...