Physics-
General
Easy

Question

In the set up shown in Fig the two slits, S subscript 1 end subscriptand S subscript 2 end subscript are not equidistant from the slit S. The central fringe at O is then

  1. Always bright    
  2. Always dark    
  3. Either dark or bright depending on the position of S    
  4. Neither dark nor bright.    

The correct answer is: Either dark or bright depending on the position of S


    If path difference D = (SS1 + S1O) – (SS2 + S2O) = nl n = 0, 1, 2, 3, .... the central fringe at O is a bright fringe and if the path difference capital delta equals open parentheses n minus fraction numerator 1 over denominator 2 end fraction close parenthesesl, n = 1, 2, 3, ..... the central bright fringe will be a dark fringe

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