The x−y plane is the boundary between two transparent media. Medium -1 with z≥0 has a refractive index 2 and medium -2 with z≤0 has a refractive index 3. A ray of light in medium -1 given by the vector A=63i^+83j^−10k^ is incident on the plane of separation. Find the unit vector in the direction of the refracted ray in medium -2.