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Easy

Question

Two coherent sources S1 and S2 are separated by a distance four times the wavelength lambda blankof the source. The sources lie along y axis whereas a detector moves along + x-axis. Leaving the origin and far off points the number of points where maxima are observed is

  1. 2    
  2. 3    
  3. 4    
  4. 5    

The correct answer is: 3

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