To measure the speed of light, Fizeau used a rotating disk with equally spaced holes through which light could pass. Light was directed at the rotating disk, passed through one of the holes, bounced from a distant mirror, and then the angular speed of the wheel was adjusted until the returning beam of light passed through the next hole in the disk. In one such experiment, the holes are placed every 0.500 degree and the mirror is 20.0 km away.nif the speed of light is 3.00 x 10^8 m/s, at what angular speed of the disk will the returning light pass through the next hole?