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+// Example 2.12 
+// Computation of (a) numerical aperature and (b) maximum angle of entrance
+// Page no 482
+
+clc;
+clear;
+close;
+
+//Given data
+n1=1.48;             // Refractive index of core
+n2=1.46;             // Refractive index of cladding
+
+// (a) Numerical Aperture 
+NA=sqrt(n1^2-n2^2);
+
+//(b) Maximum angle of entrance
+theata=asind(NA);
+
+//Displaying result in the command window            
+printf("\n Numerical Aperture  = %0.3f  ",NA);
+printf("\n Maximum angle of entrance (degress) = %0.0f  ",theata);
+
+// Final answer in the book is wrong. Please refer example 2.11 of 
+// Fiber Optic Communication by Gerd Keiser book.
+
+