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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 10.4.1
+//windows 7
+//Scilab version-6.0.0
+clc;
+clear ;
+//given
+
+//case 1
+R=0.035;//Reflectivity for the air-silica interface
+NAt=0.275;//Typical Numerical Aperture in a GI multimode fiber
+D=1;//Ratio of the diameter of the fiber core to the diameter of the source
+X=2*(D^2);
+Y=1-1/X;
+ETAcgi=(NAt^2)*Y;//The amount of light coupling in a GI multimode fiber
+
+mprintf("The amount of light coupling in a GI multimode fiber is = %.3f",ETAcgi);
+
+//case 2
+NAt2=0.13;//Typical Numerical Aperture in a SI singlemode fiber
+EATcsi=NAt2^2;//The amount of light coupling in a SI singlemode fiber
+mprintf("\nThe amount of light coupling in a SI singlemode fiber is = %.3f",EATcsi);
+//the answers vary due to rounding