The angle of refraction
will now be greater than angle of incidence; however, we will still have
n1 sin i = n2 sin r We define an angle ic by the following equation
2
1
sin c
n
i
=n
(10 8)
Thus, if i = ic then sin r = 1 and r = 90° Obviously, for i > ic, there can
not be any refracted wave