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+//Fiber-optics communication technology, by Djafer K. Mynbaev and Lowell L. Scheiner 
+//Example 2.2.3
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+n1=1.6;//refractive index in glass rod
+n2=1;//refractive index of air
+thetha2=90;//angle of refraction in degrees
+
+v=n2/n1;
+thethac=asind(v);//critical incident angle in degrees
+mprintf("the critical incident angle=%.2f degrees ",thethac);