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diff --git a/1871/CH6/EX6.12/Ch06Ex12.sce b/1871/CH6/EX6.12/Ch06Ex12.sce
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+// Scilab code Ex6.12: Pg:262 (2008)
+clc;clear;
+t = 0.003;    // Thickness of the crystal slice, cm
+Lambda = 6e-005;    // Wavelength of linearly polarized light, cm
+d_mu = Lambda/(4*t);    // Difference in the refractive indices of two rays 
+printf("\nThe difference in the refractive indices of two rays = %1.0e ", d_mu );
+
+// Result 
+// The difference in the refractive indices of two rays = 5e-003  
+\ No newline at end of file