Two coherent point sources S_1 and S_2 are se | vedclass

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(A) In the given arrangement,the two coherent point sources $S_1$ and $S_2$ are placed on the axis perpendicular to the screen.For any point $P$ on th

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concentric circles

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(A) In the given arrangement,the two coherent point sources $S_1$ and $S_2$ are placed on the axis perpendicular to the screen.For any point $P$ on the screen,the path difference $\Delta x = |S_2P - S_1P|$ is constant for a given locus of points.Since the sources are on the axis,the locus of points on the screen having a constant path difference forms a set of concentric circles centered at the point where the axis intersects the screen.Therefore,the interference fringes obtained on the screen will be concentric circles.

Two coherent point sources $S_1$ and $S_2$ are separated by a small distance '$d$' as shown. The fringes obtained on the screen will be

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