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### Density of states of Photon [duplicate]

While obtaining the density of states of photons one multiple it with 2 for two polarization states, My question is that the whole calculation is based on quantum phenomena of light so why one uses ...
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### Relation between spin and polarization of photon? [duplicate]

What is the possible spin configuration of photon? And does spin has any relation with polarization?
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### Unpolarized light, spherical wavelets and Photons

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 ...