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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)
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