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diff --git a/1655/CH2/EX2.7.17/Example_2_7_17.sce b/1655/CH2/EX2.7.17/Example_2_7_17.sce
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+// Example 2.7.17  page 2.35
+
+clc;
+clear;
+
+NA=0.25;     //Numericla aperture
+d=45d-6;        //Diameter of core
+lamda=1.2d-6;      //Wavelength
+
+a=d/2;      //computing radius
+v=2*3.14*a*NA/lamda;    //computing normalized frequency
+Mg=v^2/4;       //computing mode volume for parabollic profile
+Mg=round(Mg);
+printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,Mg);
+printf("\n\nNOTE - In the question NA is given 0.22. However while solving it is taken as 0.25");
+
+// answer in the book for number of guided modes is given as 216, deviation of 1.
+
+printf("\nHence solving for NA = 0.22 also,");
+printf("\n\nWhen NA=0.22");
+
+NA=0.22;     //Numericla aperture
+d=45d-6;        //Diameter of core
+lamda=1.2d-6;      //Wavelength
+
+a=d/2;      //computing radius
+v=2*3.14*a*NA/lamda;    //computing normalized frequency
+Mg=v^2/4;       //computing mode volume for parabollic profile
+Mg=round(Mg);
+printf("\nNormalized Frequency is %.1f.\nTotal number of guided modes are %.d.",v,Mg);
+
+