Michelson-Morley Experiment
What does this swimming race have to do with Michelson-Morley?
- Replace swimmers with light beams (speed s = c)
- Replace river with the ether
- Try to measure the velocity of the ether (wrt Earth) by setting up a race for light and see who wins and by how much!
If ether “wind” moves to the right in this diagram, we expect light beam going up and down to beat the one going right and left.