Under what conditions can path difference and phase difference are equal

p i

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2 p i

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p i / 2

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2 p i / 3

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Solution

The correct option is B $2 p i$
Path difference and phase difference are related by the equation
Path difference = $(λ / 2 π)$ phase difference
If both are equal, then wavelength = $2 p i$
The correct option is (b)

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