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+//Example 4
+//Chapter 41
+//clc()
+n2=1.33
+n1=1.50
+theta_c=asind(n2/n1)
+disp(theta_c,"Angle theta_c in degree=")
+disp("Actual angle of indices =45 is less than theta_ c, so there \n is no internal angle reflection")
+disp("angle of refraction=")
+x=n1/n2
+theta_2=asind(x*sind(45))
+disp(theta_2,"theta_2 in degree=")
+\ No newline at end of file