Communications
Revolution 		Communications
Networks 		Optical
Fibres 		Photonic
Devices 		Future of
Communications 		Credits

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QUESTION 1: In order to see a rainbow which conditions must be
met:


 the sun and rain positions do not matter

 the sun and the rain must be in front of me 

 the sun and the rain must be behind me 
 
 the sun must be in front of me and the rain behind me

 the sun must be behind me and the rain in front of me














QUESTION 2:  What is the critical angle that must be reached
to have total internal reflection within the droplet knowing that:

  • the index of refraction of air is 1
    • 

  • the index of refraction of water is 1.33
    • 

    
NB: you may round up to the next number or give the result with no more than 
2 decimal points.

    

    


    

    



    


QUESTION 3: In order to have total internal reflection within the
droplet, should the angle between the ray and the normal to the droplet be:

    
 equal to the critical angle
    
 smaller than  the critical angle
    
 greater than  the critical angle
     


    



    

    


    

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