- #1
peeballs
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- Homework Statement
- I am given a diagram of two layers in the earth that a planar wave travels through: the wave is propagating upward at 4km/s and when it crosses into the next layer, the velocity is reduced to 2km/s. The rays encounter a cylindrical-shaped depression small enough that sin\theta = \theta. The radius of the cylinder is 1km. Find the height of the focus point.
- Relevant Equations
- eta = u*cos(theta), (u_1)*\(theta_1) = (u_2)*\(theta_2)
So far all I can work out is that the angle of incidence of the outer two and inner two rays is zero degrees, however, I can't work out how to get started on the problem. I feel like I need to use vertical slowness rather than the normal snell's law since I'm working with a dZ rather than a dX, but all of the equations that feature dZ also feature time, so I'm at a bit of a loss here. A nudge to get started would be appreciated.