Question: Two coherent plane waves with wave vectors ~k1 = k[cos 30?ˆi + sin 30?ˆj]and ~k1 = k[sin 30?ˆi + cos 30?ˆj] with k = 1.2 × 10-6m-1 are incident ona screen which is perpendicular to the x axis to produce straight linefringes. Determine the spacing between two successive dark lines in thefringe pattern.