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diff --git a/1655/CH2/EX2.7.11/Example_2_7_11.sce b/1655/CH2/EX2.7.11/Example_2_7_11.sce
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+// Example 2.7.11  page 2.29
+
+clc;
+clear all;
+
+n1=1.5;       //refractive index of core
+n2=1.38;       //refractive index of cladding
+lamda=1300d-9;       //Wavelength
+a=25d-6;        //core radius
+
+NA=sqrt(n1^2 - n2^2);       //computing Numerical aperture
+theta= asind(NA);        //computing acceptance angle
+solid_angle=%pi*(NA)^2;     //computing solid angle
+v= 2*%pi*a*NA/lamda;      //computing normalized frequency
+M=(v)^2/2;      //computing guided modes
+M=round(M);
+printf("\nNumerical aperture is %.2f.\nNormalized frequency is %.2f.\nAcceptance angle is %.2f degrees.\nSolid angle is %.3f radians.\nTotal number of modes are %d.",NA,v,theta,solid_angle,M);
+printf("\n\n NOTE - Calculation error in the book.\n(2.25-1.9)^0.5=0.59; they have taken 0.35");
+
+
+//Calculation error in the book.(2.25-1.9)^0.5=0.59; they have taken 0.35
+//answers in the book,
+//Numerical aperture is 0.35.(incorrect)
+//Normalized frequency is 42.26.(incorrect)
+//Acceptance angle is 20.48 degrees.(incorrect)
+//Solid angle is 0.384 radians.(incorrect)