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  4. Two coherent point sources S1 and S2 are separated by a small distance d as shown in the figure. The fringes obtained on the screen will be <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-pmbsxhci85jquktx.jpg />

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Q. Two coherent point sources $S_{1}$ and $S_{2}$ are separated by a small distance $d$ as shown in the figure. The fringes obtained on the screen will be
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NTA AbhyasNTA Abhyas 2022

Solution:

Path difference on circles around $P$ is same. So, The fringes obtained on the screen in the given condition will be concentric circles.