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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 3.1.3
+//windows XP
+//Scilab version-5.1.1
+clc;
+clear;
+//given
+
+//case 1
+n1=1.48;//refractive index of the core
+n2=1.46;//refractive index of the cladding
+
+alphac=asin(sqrt(1-(n2/n1)^2));
+mprintf("\n The Critical propogation angle for case 1 = %.2f deg",alphac);
+b=sin(alphac);
+thetaa=asind(n1*b);//by snell's law
+
+a=2*thetaa;//acceptance angle of the fiber
+mprintf("\nThe acceptance angle for case 1 is = %.2f deg",a);
+
+//case 2
+n3=1.495;//refractive index of the core
+n4=1.402;//refractive index of the cladding
+
+alphac2=asin(sqrt(1-(n4/n3)^2));
+mprintf("\n The critical propagation angle for case 1 = %.2f deg",alphac2);
+b2=sin(alphac2);
+thetaa2=asind(n3*b2);//by snell's law
+
+a2=2*thetaa2;//acceptance angle of the fiber
+mprintf("\nThe acceptance angle for case 2 is = %.2f deg",a2);