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+//Example 11.1
+//Program to determine the Voltage required for a phase change of 
+//pi radians
+
+clear;
+clc ;
+close ;
+
+//Given data
+L=2*10^-2;            //metres - LENGTH OF THE WAVEGUIDE
+Lambda=1.3*10^-6;     //metres - WAVELENGTH
+d=25*10^-6;           //metres - DISTANCE BETWEEN THE ELECTRODES
+r=30.8*10^-12;        //m/V    - ELECTRO-OPTIC COEFFICIENT
+n1=2.1;               //REFRACTIVE INDEX AT 1.3um WAVELENGTH
+
+//Calculation of the Voltage required for a phase change of pi radians
+V_pi=(Lambda*d)/((n1^3)*r*L);
+
+//Displaying the Result in Command Window
+printf("\n\n\t Voltage required for a phase change of pi radians is %0.1f V.",V_pi);
+\ No newline at end of file