An interference is observed due to two coherent sources ‘A’ & ‘B’ separated by a distance 4λ along the y-axis where λ is the wavelength of the source. A detector D is moved on the positive x-axis. The number of points on the x-axis excluding the points, x = 0 & x = ∞ at which maximum will be observed is –
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At 
path difference is 
i.e. fifth bright fringe will be obtained at 
and at 
, path difference is 0 , hence first or central bright fringe will be obtained at 
, therefore between 
and 
bright fringe, the number of fringes will be 3 .
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