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Two point sources are d = nlambda apart....

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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The correct Answer is:
`[sqrt((2D(D+nlambda))/(n))]`
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