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+// Scilab Code Ex2.30:: Page-2.21 (2009)
+clc; clear;
+b = 1;      // For simplicity assume fringe width to be unity, cm
+S = 30*b;   // Fringe shift, cm
+lambda = 6600e-008;     // Wavelength of light used, cm
+t = 4.9e-003;       // Thickness of the film, cm
+// As S = b/lambda*(mu-1)*t, solving for mu
+mu = S*lambda/t + 1;       // Refractive index of material from shifting fringe pattern
+
+printf("\nThe refractive index of material from shifting fringe pattern = %3.1f", mu);
+
+// Result 
+// The refractive index of material from shifting fringe pattern = 1.4