Note that from Snell's law,    Â
  Â
       Â
n1sin(t1) = n2sin(t2)Â Â Â Â Â
  Â
       Â
where       Â
       Â
n1 = index of refraction of first medium = Â Â
1.5Â Â Â Â Â
t1 = angle of incidence = Â Â 30Â Â
degrees Â
n2 = index of refraction of second medium = Â Â
1Â Â Â Â Â
t2 = angle of refraction
       Â
Thus,       Â
       Â
t2 = Â Â 48.59Â Â Â
degrees  [ANSWER]
I used the index of refraction of glass as 1.50. In case you
use a different value, please use that one.