The magnetic field in a plane monochromatic electromagnetic wave with wavelength = 577nm, propagating in a vacuum in the z-direction is described by where B1=7.6 × 10⁻⁶ T, and î and ĵ are the unit vectors in the + x and + y directions, respectively.
→
B = (B₁ sin (kz - wt))(î + ĵ)