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+// Example 2.2.a: Critical Angle
+clc;
+clear;
+close;
+n1=1.50;//Waveguide Refractive Index
+n2=1.47;//Cladding Refractive Index
+Oc=asind(n2/n1);//Critical Angle
+oc=floor(Oc);//
+x=Oc-oc;//
+disp("CRITICAL ANGLE IS "+string(oc)+" DEGREE AND "+string(round((60*(x))))+" MINUTES ")
+//answer is wrong in the textbook