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(B) In an interference pattern,the condition for constructive interference is that the path difference $\Delta x$ must be an integral multiple of the

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(B) In an interference pattern,the condition for constructive interference is that the path difference $\Delta x$ must be an integral multiple of the wavelength $\lambda$,i.e.,$\Delta x = n\lambda$ where $n = 0, 1, 2, \dots$.The central maximum occurs at the point where the path difference between the two waves is zero $(\Delta x = 0)$.The relationship between phase difference $\phi$ and path difference $\Delta x$ is given by $\phi = \frac{2\pi}{\lambda} \Delta x$.Substituting $\Delta x = 0$ into the equation,we get $\phi = \frac{2\pi}{\lambda} 	imes 0 = 0$.Therefore,for the central maximum,the phase difference is $0$.

Two coherent sources of light interfere and produce a fringe pattern on a screen. For the central maximum,the phase difference between the two waves will be,

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