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diff --git a/1655/CH7/EX7.2.3/Example_7_2_3.sce b/1655/CH7/EX7.2.3/Example_7_2_3.sce
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+++ b/1655/CH7/EX7.2.3/Example_7_2_3.sce
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+// Example 7.2.3  page 7.12
+
+clc;
+clear;
+
+r=25d-6;        //radius
+R=39;      //Lambertian emission pattern
+NA=0.25;    //numerical aperture
+a=35d-6;    //area
+Pc1= %pi^2*a^2*R*NA^2;  //computing coupled power when r<a
+Pc1=Pc1*10^7;
+Pc= %pi^2*r^2*R*NA^2;   //computing coupled power when r>a
+Pc=Pc*10^7;
+
+printf("\nOptical power when r>a is %.2f mW.\nOptical power when r<a is %.3f mW.",Pc,Pc1);
+