1. The problem statement, all variables and given/known data The question is set up by a diagram. It has: Layer 1 velocity = 6km/s Layer 2 = calculated velocity of 7.58 km.s Layer 3 = reflection The angle of the source in layer 1 is 34 degrees, the angle in layer two is then 52.33 degrees The source then reflects off of layer 3. Question: Do these reflections tell you anything about the velocities in layer 3? 2. Relevant equations Snells law 3. The attempt at a solution I am thinking two things: 1) Either the answer is NO, it does not tell us about the velocity, it only tells us about the composition in that the source does not travel through it, but reflects off of it. 2) YES it does tell us about the velocity of layer three because it does not go through it, so layer three must be significantly slower. I am tending to agree more with argument one, any help here?