Human: What are the different ways to measure the speed of light? Assistant: 

1.  The most common way is to use a technique called “time-of-flight” in which two synchronized clocks are set up at either end of the path and the time it takes for a photon to travel from one clock to another is measured.
2.  Another way is to use an optical interferometer, which splits a single beam of light into two beams that then recombine after traveling along separate paths.