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+//Example 2.12
+//Program to determine relative refractive index difference using ESI
+//technique
+
+clear;
+clc ;
+close ;
+
+//Given data
+lambda_c=1.19*10^(-6);       //metre - CUTOFF WAVELENGTH
+w0=5.2*10^(-6);              //metre - SPOT SIZE
+n1=1.485;                    //MAXIMUM REFRACTIVE INDEX OF THE CORE
+
+// The ESI core diameter
+d_ESI=1.820*w0;
+
+// The ESI relative index difference
+delta_ESI=(0.293/n1^2)*(lambda_c/d_ESI)^2;
+
+//Displaying the Result in Command Window
+printf("\n\n\t The relative refractive index difference using ESI technique is %0.2f percent.",delta_ESI*10^2);
+\ No newline at end of file