A "ray diagram" would start with a line from a point on the fish to the global fish bowl, which you can represent as a circle. Draw a tangent to the circle at that point. Measure the angle that line makes with the circle, $\displaystyle \theta$. Determine $\displaystyle \phi$ from $\displaystyle \frac{sin(\phi)}{sin(\theta)}=\frac{1}{1.33}$.
