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+// Scilab Code Ex2.31:: Page-2.22 (2009)
+clc; clear;
+mu1 = 1.55;     // Refractive index of mica
+mu2 = 1.52;     // Refractive index of glass
+t = 0.75e-003;  // Thickness of the sheets, m
+d = 0.25e-02;   // Separation between the slits, m
+lambda = 5896e-010; // Wavelength of light used, m
+D = 1.5;    // Distance between the source ans the slits, m
+// Fringe width
+b = lambda*D/d;     // Fringe width, m
+// Optical path difference
+delta_x = (mu1-1)*t-(mu2-1)*t;  // Optical path change, m
+
+printf("\nThe fringe width = %3.1e m", b);
+printf("\nThe optical path change = %5.3e m", delta_x);
+
+// Result 
+// The fringe width = 3.5e-004 m
+// The optical path change = 2.250e-005 m