two square reflectors, each 2.00 cm on a side and of mass 4.00 g, are located at opposite ends of a thin, extremely light, 1.00 m rod that can rotate without friction and in a vacuum about an axle perpendicular to it through its center (figure 1). these reflectors are small enough to be treated as point masses in moment-of-inertia calculations. both reflectors are illuminated on one face by a sinusoidal light wave having an electric field of amplitude 1.30 n/c that falls uniformly on both surfaces and always strikes them perpendicular to the plane of their surfaces. one reflector is covered with a perfectly absorbing coating, and the other is covered with a perfectly reflecting coating. What is the angular acceleration of this device?