40
                           
                           
                              
                           
                           
                           
                           
                                                      
                           
                  
                  
                  
                           
                                                                                 
                           
                              
                                                            
                                 
                                 
                                 
                              
                           
                           
                           
                           
                           
                        
                        
                     
                              Q:
                           
                           
                                                      | A) Scattering | B) interference | 
| C) total internal reflection | D) refraction | 
                              Answer:   C) total internal reflection
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:

Optical fiber works on the principle of total internal reflection.
The Total Internal Reflection is the phenomenon in which the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.
 
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