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+// Example 1.7.1  page 1.14

+//To calculate the angel of refraction if the angle of incidence is 30

+

+clc;

+clear;

+n1= 1.5; // for glass

+n2= 1.33; // for water

+phi1= (%pi/6);          // phi1 is the angel of incidence

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

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

+sinphi2= (n1/n2)*sin(phi1); // phi2 is the angle of refraction..

+phi2 = asind(sinphi2);

+printf(' The angel of refraction is %.2f degrees',phi2);