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Fiber Optic Bi-directional Communication
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1)In an optical fiber, the inner core is _______ the cladding. 
  

2)The inner core of an optical fiber is _______ in composition. 
  

3)When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs. 
  

4)When the angle of incidence is _______ the critical angle, the light beam bends along the interface. 
  


  


 

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