sin ɵ = 1.22 ʎ/D - first dark fringe for diffraction of a circular opening , w sin ɵ = mʎ ( m= ±1, ±2, ..) - dark fringes in single-slit interference , 2nt = mʎ m = 1,2,3, .. - destructive interference in thin film, 2nt = (m+1/2) ʎ - constructive interference in thin film, 2d + 1/2 ʎ= mʎ m= 1,2,3,.. - constructive interference of wedge-shaped volume of air, 2d +1/2 ʎ = (m+1/2 ) ʎ m= 0,1,2,3, .. - destructive interference of wedge-shaped volume of air, y= L tan ɵ - linear distance from the central bright fringe , d sin ɵ = mʎ m= 0, ±1, ±2, .. - bright fringes in two slits experiment , d sin ɵ = (m+1/2) ʎ m= 0, ±1, ±2, .. - dark fringes in two slits experiment, ɩ2 - ɩ1 = mʎ m = 0,1, 2,3 - constructive interference , ɩ2 - ɩ1 = (m+1/2)ʎ m = 0,1, 2,3 - destructive interference ,

Interference Equations

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