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clc();
clear;
//Given:
r = 90; // in degrees
mu_o= 1.658 ;// Refractive index for ordinary array
mu =1.55; // Refractive index for a canada balsam material
//Snell's Law,mu1*sin(i) = mu2*sin(r), we have :
i = asind((mu*sind(90))/mu_o); // angle in degrees
printf("Critical angle = %d degrees",i);
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