1. And the angle of refraction is theta 2.

2. So we know this is our incident angle This is our angle of refraction

3. Let's think about what the incident angle is and what the angle of refraction

4. So the car will travel in this direction, like that where this angle right over here is the angle of refraction

5. A horizontal angle of refraction is determined between the acoustic signal and the at least one refracted signal from the interference pattern.

6. Since the angle of refraction is β, Snell's law gives us sin(2β − φ) = n sin β, where n = 1.333 is the refractive index of water.