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+// Example no. 4.5
+// To calculate the Brewster angle
+// Page no. 119
+
+clc;
+clear all;
+
+// Given data
+Er=4;                                 // Permittivity
+x=sqrt((Er-1)/(Er^2-1));              // Sine of brewster angle
+theta=asind(x);                       // Brewster angle
+//Answer is varrying due to round off error
+
+// Displaying the result in command window
+printf('\n Brewster angle = %0.2f degree',theta);