photon-spin

= Photon spin

https://physics.stackexchange.com/questions/73942/how-do-we-know-photons-have-spin-1

Original 1931 experiment by Raman and Bhagavantam: http://dspace.rri.res.in/bitstream/2289/2123/1/1931%20IJP%20V6%20p353.pdf

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