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+// Example 1.7.3 page 1.15

+//  To find RI of glass

+// To find the critical angle for glass...

+

+clc;

+clear;

+phi1 = 33   // Angle of incidence..

+phi2 = 90   //Angle of refraction..

+// According to Snell's law...

+// n1*sin(phi1)= n2*sin(phi2);

+//a = sin(phi1*%pi/(180));

+// Assume n1 is the RI of glass and n2 is RI of air

+n2= 1;

+n1 = sind(90)/sind(33);

+printf('The Refractive Index is  %.2f',n1);

+

+// To calculate thre critical angle...

+n1 =  1.836;    // From above rounded off to 3 decimal points...

+phiC = asind((n2/n1)*sind(90));

+phiC=asind(0.54);

+printf('\n\nThe Critical angel is  %.2f degrees',phiC);