The ratio of phase difference and path difference is :

2 π

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\frac{2 π}{λ}

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\frac{λ}{2 π}

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\frac{π}{λ}

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Solution

The correct option is A $\frac{2 π}{λ}$
phase difference be $α$ and path difference be $x$
then ,
$α = \frac{x}{λ} \times 2 π$
$\frac{α}{x} = \frac{2 π}{λ}$
option $B$ is correct

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