In the middle of the 19th century Hippolyte Fizeau and Leon Foucault used a rotating mirror to determine the speed of light in a manner similar to what is shown in the figure below. A plane mirror rotating at 2100 revolutions per minute reflects a collimated beam of light onto a stationary mirror a distance D=100 m away, which reflects the beam back toward the rotating mirror. While the light beam is in transit the mirror rotates so that the reflected beam then makes an angle of 80=0.0170 with respect to the initial light beam. From this experiment, to three significant figures, what is the speed of light? (Important: the answer is not the speed of light given in the textbook.) Light source Collimator Stationary Plane Rotating Mirror D Plane Mirror