Answer to Question

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