An Aquarium Contains a 5-Cm Layer of Water (N = $\degree$

An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461) .If the angle of incidence into the water from the carbon tetrachloride is 20 $\degree$ ,what is the angle of refraction into the air?

A) 20 $\degree$
B) 30 $\degree$
C) 38 $\degree$
D) 69 $\degree$
E) 26 $\degree$