In Fig. 1 the wavefronts in the incident medium match the fronts in the transmitting mediu...

In Fig. 1 the wavefronts in the incident medium match the fronts in the transmitting medium everywhere on the interface—a concept known as wavefront continuity. Write expressions for the number of waves per unit length along the interface in terms of θi; and λi− in one case and θt, and λt in the other. Use these to derive Snell's Law. Do you think Snell's Law applies to sound waves? Explain.

Figure P.1