# Two point sources are d = nlambda apart. A screen is held at right angles to the line joining the two sources at a distance D from the nearer source

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Two point sources are d = nlambda apart. A screen is held at right angles to the line joining the two sources at a distance D from the nearer source. Calculate the distance of the point on the screen where the first bright fringe is observed. Assume Dgtgtd.

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Correct Answer - [sqrt((2D(D+nlambda))/(n))]