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+// Example 2.3
+//  Calculation of (a) critical angle (b) numerical aperature and (c) acceptance angle
+// Page no 38
+
+clc;
+clear;
+close;
+
+// Given data
+n1=1.5;                           // Refractive index of core
+n2=1.47;                          // Refractive index of cladding)
+
+// (a) Critical angle
+theatha=asind(n2/n1);            
+// (b) Numerical aperature
+NA=sqrt(n1^2-n2^2);               
+// (c) Acceptance angle
+theatha1=asind(NA);                     
+
+//Display result on command window
+printf("\n Critical angle (degrees) = %0.1f  ",theatha);
+printf("\n Numerical aperature = %0.2f  ",NA);
+printf("\n Acceptance angle (degrees) = %0.1f  ",theatha1);
+