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+// Example 2.2
+// Calculation of (a) critical angle (b) acceptance angle and oblique angle (c) numerical aperature 
+// (d) percentage of light collected by the fiber and (e) diameter of fiber
+// Page no 35
+
+clc;
+clear;
+close;
+
+// Given data
+n1=1.5;                           // Refractive index of core
+n2=1.45;                          // Refractive index of cladding
+V=2.405;                          // Mode parameter
+lambda=1.55                       // Wavelength of fiber
+
+// (a) Critical angle of the
+theatha=asind(n2/n1);             
+
+// (b) Oblique angle
+oa=90-theatha;                       
+ //Acceptance angle   
+t1=n1*sind(oa);  
+th1=asind(t1); 
+
+// (c) Numerical aperature                      
+NA=sqrt(n1^2-n2^2);                   
+
+// (d) Percentage of light collected in fiber
+P=(NA)^2*100;                        
+
+//(e) Diameter of fiber
+d=V*lambda/%pi*(1/sqrt(n1^2-n2^2));  
+
+//Display result on command window
+printf("\n Critical angle (degrees) = %0.0f  ",theatha);
+printf("\n Oblique angle (degrees) = %0.0f  ",oa);
+printf("\n Acceptance angle (degrees) = %0.0f  ",th1);
+printf("\n Numerical aperature = %0.4f  ",NA);
+printf("\n Percentage of light collected in fiber = %0.1f  ",P);
+printf("\n Diameter of fiber (micrometer)  = %0.2f  ",d);
+