Use _an_w = sin q1  

                 sin q2

[_an_w is the refractive index passing from air to water.]

Put in the numbers:

1.33 =  sin 48^o

             sin q2

sinq2 = 0.743 ÷ 1.33 = 0.559

q2 = sin^-1(0.559) = 34^o

The angle of deviation is 48 – 34 = 14^o