Abstract
In this report, the speed of light in air is inferred with the use of a Michelson interferometer built from Pasco's basic microwave optics system. We vary the length of one of the interferometer's arms and count the number of corresponding fringe shifts of the light in a transceiver. A voltmeter is used in the microwave transceiver to measure the variation in the light's intensity while the length of the arm is varied. After inferring the wavelength of the transmitted light, we determine the speed of light to be (3.01 +/- .021) 10^8 m/s, which is 10% greater than the speed in a vacuum.
