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+//Example 25.4
+n1=1.49;//Index of refraction for polystyrene, See Table 25.1
+n2=1;//Index of refraction for air,
+theta_c=asind(n2/n1);//Critical angle (deg)
+printf('Critical angle = %0.1f deg',theta_c)
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest