Question:How do optical fiber help us communicate?
Light and infrared radiation are both very useful for communications but they one travel in straight lines, which is not always useful.
This means we either need 'line of sight' between sender and receiver or an awful lot of mirrors that never move or get disturbed between every pair of sender and receiver.
Light and infrared radiation can travel along an optical fibre from one end to another by total internal reflection from the sides of the fibre, even if the fiber is curved.
So optical fibers act as a guide for the light or infrared radiation and allow us to send signal even when a straight line of sight is not available.