Interference is observed due to two coherent sources A and B having zero phase difference separated by a distance 4 λ along the y -axis, where λ is the wavelength of the source. A detector D is moved

Question

Interference is observed due to two coherent sources $A$ and $B$ having zero phase difference separated by a distance $4 λ$ 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 $x = 0$ and $x = \infty$ at which maximum will be observed is

TestHub · Accepted Answer

At x = 0 path difference is 4 λ i.e. fifth bright fringe will be obtained at x = 0 and at x = ∞ , path difference is 0 , hence first or central bright fringe will be obtained at x = ∞ , therefore between 1 s t and 5 t h bright fringe, the number of fringes will be 3 .

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