A wave is traveling from medium A to medium B. The ratio: r.i B / r.i A = 1.4. The angle between an incident wavefront and the normal to the boundary is 50 degrees. Calculate the angle between a refracted wavefront and the normal to the boundary: This is what I did: nAsin i = nB sin r sin 50 = 1.4 sin r r = 33.2 degrees Is that correct? Thanks, Peter G.