A narrow ray traveling in air strikes a smooth surface of water,what is teh angle of refraction?

A narrow ray of yellow light from glowing sodium (wavelength= 589 nm) traveling in air strikes a smooth surface of water at an angle of incidence = 35.5°. Determine the angle of refraction, r

n1 sin(i) = n2 sin(r)

sin(r) = n1 sin(i) / n2

i = 35.5 deg

n1 the refraction index of the air

n2 the refraction index of water