Snell's Law -synthesis calculations

Light travels from fiber optic cable into air with an angle of incidence (θi) of 21.5 °. What is the angle of refraction (θr) if the refractive index of fiber optic cable is 1.6 and the refractive index of air is 1.

The angle of refraction is: ° (Give your answer to the nearest 10th of a degree)