Before I get to the core of my question, I would like clarify my understanding of unpolarized light. Below are 2 images of unpolarized light from Google:
The first one seems to be in accordance with my understanding- the electric fields (and magnetic fields) have different planes of vibrations.
In the second one however, the unpolarized light seems to consist of 3 different light waves, each having different planes of vibration. But these vibrations seem to be constant for each wave. Thus, they would interfere and the resultant wave would contain vibrations in one plane. So I feel that this representation is not consistent. Please correct me if I am wrong.
Light bulbs produce unpolarized light, right? And these travel in the form of spherical wavefronts (concentric spheres). Based on my understanding, I have sketched the following.
What I have depicted is a crest of a spherical wavefront. (I have shaded the corners to make the wavefront look like a sphere.)
So, my questions about this unpolarized light are:
1) Are the orientations of the electric field and magnetic field constant for a given wavefront? (i.e.), for a given wavefront, does the plane of vibration of the electric field remain the same?
2) Is the light unpolarized because the orientation of the electric and magnetic fields are different for each wavefront (as shown in my sketch)? Or because the plane of vibration changes each instant for a given wavefront itself?
3) How can I relate all this to a photon of light? Does one photon mean the same thing as one wavefront?