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Phase Change with Position #8211; At any instant t, if ╔╕<sub>1</sub> and ╔╕<sub>2</sub> are the phase of two particle whose distances from origin are x<sub>1</sub> and x<sub>2</sub>, respectively. Then, ╔╕<sub>1</sub> = (ωt #8211; kx<sub>1</sub>) and ╔╕<sub>2</sub> = (ωt #8211; kx<sub>2</sub>) ⇒ тИЖ╔╕ = k (тИЖx) ⇒ (тИЖ╔╕) ⇒ ╔╕<sub>1</sub> #8211; ╔╕<sub>2</sub> = k(x<sub>2</sub> #8211; x<sub>1</sub>) So, phase difference, тИЖ╔╕ = 2π/λ times; Path difference (тИЖx)
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