Does light have magnetic poles?

Question

If visible light is electromagnetic field of certain wavelength does it form closed loops?

Answer 1

As far as we know, there are no magnetic monopoles, in light or anywhere else. This is what $\vec{\nabla}\cdot\vec{B}=0$, which is one of Maxwell’s equations, says. Thus magnetic field lines have nowhere to “end”. They form closed loops or extend to infinity.