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+//Example number 12.5, Page number 265
+
+clc;clear;
+close;
+
+//Variable declaration
+n1=1.53;          //Core refractive index
+n2=1.42;          //Cladding refractive index
+//Calculation
+thetac=asin(n2/n1);     //critical angle(radian)
+thetac=thetac*180/%pi;    //critical angle(degrees)
+//Resul"
+printf("critical angle is %.2f degree",thetac)