In the figure on the geometry the particle red arrow travels in a medium with speed such that. Velocity of wave propagation formula. In vacuum the speed of light is c 299792458 x 10 8 ms This vacuum speed of light c is what the statements from relativity describe.
The phase velocities of light in medium 1 and medium 2 are and respectively.
First determine the frequency. Is the speed of light in that medium measured in is the speed of light in a vacuum measured in. We assume we are in a source free region - so no charges or currents are flowing. The difference in the two frequencies is fed into a modified form of the above equation and a speed is calculated.