The figure shows two point sources which emit light of wavelength λ in phase with each other and are at a distance d = 5.5 λ apart along a line which is perpendicular to a large screen at a distance L from the centre of the source. Assume that d is much less than L. Which of the following statement(s) is (are) correct?

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The figure shows two point sources which emit light of wavelength λ in phase with each other and are at a distance d = 5.5 λ apart along a line which is perpendicular to a large screen at a distance L from the centre of the source. Assume that d is much less than L. Which of the following statement(s) is (are) correct?

Only five bright fringes appear on the screen

Point y = 0 corresponds to bright fringe

Point y = 0 corresponds to dark fringe.

Only six bright fringes appear on the screen

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Path difference at y = 0 Dx = 5.5λ = 11 $\frac{λ}{2}$

So at y = 0 fringe is dark fringe

For y > 0 maximum path difference is zero so, six dark and five bright fringe will appear.