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+// Scilab code Ex10.5: Pg:419 (2008)
+clc;clear;
+n = 1.5;    // Refractive index of glass
+E = 1;    // For simplicity assume electric field strength to be unity, N/C
+epsilon_0 = 8.85e-012;    // Permittivity of free space, farad per metre
+epsilon_r = 6.75;    // Relative permittivity of free space at optical frequencies
+mu = 1.5;    // Refractive index for glass
+P_e = epsilon_0*(n^2 - 1)*E;        // Electronic polarizability, farad Sq.m
+P_i = epsilon_0*(epsilon_r - n^2)*E;    // Ionic polarizability, farad Sq.m
+percent_P_i = P_i/(P_e+P_i)*100;    // Percentage ionic polarizability
+printf("\nPercent ionic polarizability for glass = %3.1f percent", percent_P_i);
+
+// Result 
+// Percent ionic polarizability for glass = 78.3 percent  
+\ No newline at end of file