just a brief note on fiber optics.....

  
Fiber optics is very fine filaments of transparent glass covered 


with a plastic material that transmits light long its axis by the 


process of total internal reflection.They are flexible and 


resistant .They are used to illuminate and to observe places that 


are not easily reached(inside the human body,for example) or to 


transmit coded information in the form of light signals(for 


example,in telephonic network).Due to the high speed of 


transmission, approximately two or three times the speed of 


light and the ability to transfer  remarkable volume of 


information,fiber optics are the method of communication for 


the future.Fiber optics is used to look inside the human body. 


Because they are so fine and flexible,they can reach parts of the 


body,which could not be otherwise reached without 


surgery.Fiber optics can illuminate  part of the body and 


transmit images to the doctor who can see these on  separate and 


external screen.These re used s hydrophones for seismic and 


SONAR uses,s wiring in aircraft, submarines and other vehicles 


and also for field networking.