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+// Scilab code Ex4.20 : Pg:159 (2008)
+clc;clear;
+D = 10;    // The distance between the slits and the screen, cm
+d = 0.2/2;    // Half the separation between two slits, cm
+lambda = 6000e-008;    // Wavelength of light used, cm
+t = 0.05;    // Thickness of transparent plate, cm
+x0 = 0.5;    // The shift of interference pattern, cm
+// As x0 = D/(2*d)*(mu - 1)*t, solving for mu
+mu = 2*d*x0/(D*t)+1;    // The refractive index of transparent plate
+printf("\nThe refractive index of transparent plate = %3.1f", mu);
+
+// Result 
+// The refractive index of transparent plate = 1.2 
+\ No newline at end of file