Two coherent sources $S_{1}$ and $S_{2}$ are situated on the x-axis, screen ‘S’ is in y –z plane(as shown). The shape of the fringe on the screen is

Straight line

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Elliptical

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Circular

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Rectangular

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Solution

The correct option is C Circular
When screen is parallel to line joining coherent sources $S_{1}$ and $S_{2}$ , then shape of fringe is hyperbolic but central bright fringe is straight line.
When screen is perpendicular to the line joining the sources $S_{1}$ and $S_{2}$ , then the shape of fringe is circular.

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