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+// Scilab Code Ex2.26:: Page-2.20 (2009)
+clc; clear;
+lambda = 5400e-008;     // Wavelength of light used, cm
+mu = 1.7;   // Refractive index of material sheet convering the first slit
+mu_prime = 1.5;     // Refractive index of material sheet convering the seecond slit
+// As shift, S = D/d*(mu - mu_prime)*t = b/lambda*(mu - mu_prime)*t, solving for t
+t = 8*lambda/(mu-mu_prime)    // Thickness of the glass sheet, cm
+
+printf("\nThe thickness of the glass sheet = %4.2e cm", t);
+
+// Result 
+// The thickness of the glass sheet = 2.16e-003 cm