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(B) In a Young's double slit experiment, the condition for constructive or destructive interference at any point $P(x, y)$ on the screen is that the p

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hyperbola

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(B) In a Young's double slit experiment, the condition for constructive or destructive interference at any point $P(x, y)$ on the screen is that the path difference between the waves from the two slits $S_1$ and $S_2$ must be constant.Mathematically, this is expressed as $|PS_1 - PS_2| = 	ext{constant}$.By definition, the locus of a point such that the difference of its distances from two fixed points (the foci, which are the slits $S_1$ and $S_2$) is constant, is a hyperbola.Therefore, the interference fringes formed on the screen are hyperbolic in shape.

$A$ Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

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