Physics-
General
Easy

Question

Two coherent narrow slits emitting light of wavelength lambda in the same phase are placed parallel to each other at a small separation of 2 lambda. The light is collected on a screen S which is placed at a distance D left parenthesis much greater-than lambda right parenthesis from the slit S subscript 1 end subscript as shown in figure. Find the finite distance x such that the intensity of P is equal to intensity at O.

  1. fraction numerator D over denominator square root of 3 end fraction    
  2. square root of 3 D    
  3. fraction numerator square root of 3 over denominator 2 end fraction D    
  4. fraction numerator D over denominator 2 end fraction    

The correct answer is: square root of 3 D

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