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diff --git a/1655/CH2/EX2.10.1/Example_2_10_1.sce b/1655/CH2/EX2.10.1/Example_2_10_1.sce
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index 000000000..9b6d55324
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+++ b/1655/CH2/EX2.10.1/Example_2_10_1.sce
@@ -0,0 +1,25 @@
+// Example 2.10.1  page 2.39
+
+clc;
+clear;
+
+a=4.5d-6;        //core diameter
+delta=0.25/100;      //relative index difference
+lamda=0.85d-6;       //operating wavelength
+n1=1.46;     //core refractive index
+
+v= 2*%pi*a*n1*sqrt(2*delta)/lamda;      //computing normalized frequency
+lamda_cut_off=v*lamda/2.405;        //computing cut off wavelength
+lamda_cut_off=lamda_cut_off*10^9;
+printf("\nCut off wavelength is %.d nanometer.",lamda_cut_off);
+
+printf("\n\nWhen delta is 1.25 percent-");
+delta=1.25/100;
+v= 2*%pi*a*n1*sqrt(2*delta)/lamda;      //computing normalized frequency
+lamda_cut_off=v*lamda/2.405;        //computing cut off wavelength
+lamda_cut_off=lamda_cut_off*10^7;
+lamda_cut_off=round(lamda_cut_off);
+lamda_cut_off=lamda_cut_off*100;
+printf("\nCut off wavelength is %.d nanometer.",lamda_cut_off);
+
+//answer in the book for cut off wavelength in the book is given as 1214nm, deviation of 1nm.