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+// Scilab Code Ex2.70:: Page-2.57(2009)
+clc; clear;
+N = 250;        // Number of fringes crossing the field of view
+delta_x = 0.0595e-01;   // Displacement in movable mirror, cm
+// As N*lambda/2 = delta_x, solving for lambda
+lambda = 2*delta_x/N;      // Wavelength of light used, cm
+
+printf("\nThe wavelength of monochromatic light used = %4.0f ansgtrom", lambda/1e-008);
+
+// Result
+// The wavelength of monochromatic light used = 4760 ansgtrom 
+// Answer is given wrong in the textbook