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Dear friends
I have some questions about the polarization of light. From classical Mexwell
Equation, one can give out a electromagnetic wave with polarization. And
visible
lights has polarization as well. However, one can not say that a photon
has polarization.
Spin is the property of photon to substitute polariztion in the field theory.
However, I still cannot understand why visible lights has polarization,
but a visible
photon has not.
Let's think out a ideal experiment:
There are three tubes, each one has a film in its bottum. Two of these
tube have
polarization foils (PF). I mark them 2 and 3. The polarization foils in 2 tube
are parallel, while the polarization foils in 3 tube are vertical.
'Parallel' means
the parallel of polarization, the same of 'vertical'.
----------------------------------|
| 1
----------------------------------|
film
--------|----------------|--------|
| | | 2
--------|----------------|--------|
| | film
--------|----------------|--------|
| | | 3
--------|----------------|--------|
| \ film
They are put into a dark room, i.e. a vacuum of lights. However it is not
absolute
vacuum of lights. After a week, there may be a photon enters a tube and
reach the film
in tube 1. The question is that, after several monthes, can some photon
reach the
film in 2 and 3 tubes?