Question: What wavelength monochromatic source in the visible region ( 3 9 0 to 7 1 0 nm) can be used to constructively reflect off a

 What wavelength monochromatic source in the visible region (390 to 710nm) can be used to constructively reflect off a soap film (n=1.46) if the film is 240nm thick?
 

  
 
  

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