Solving for Angle of Incidence and Speed of Light in Rock Salt
Now, to find the speed of light in rock salt, we can use the equation $v = rac{c}{n}$, where $v$ is the speed of light in the medium, $c$ is the speed of light in vacuum (approximately 3x108 m/s), and $n$ is the refractive index of the medium. For rock salt, the refractive index is again 1.54. Plugging in these values, we get the speed of light in rock salt to be approximately 1.95x108 m/s.
Therefore, to summarize, the angle of incidence of light on rock salt is about 12.93° and the speed of light in rock salt is approximately 1.95x108 m/s.