1. The problem statement, all variables and given/known data The magnetic component of a polarized wave of light is given by: Bx = (4.00μT ) sin[ky+(2.00×1015s−1)t] What direction does the light travel, and which axis is the polarization parallel to? 2. Relevant equations vector E x vector B gives direction of the light wave. 3. The attempt at a solution I've learned that the light travels in the -y direction, and that the polarization is parallel to the z-axis. However, I don't understand why. Without being given whether the electric field oscillates in the y axis or the z axis, I'm not sure how one can know that the light travels on the y axis. As for the polarization, it is always parallel to the axis in which the E-field oscillates, right? Thank you.