Breakthrough as new form of light discovered

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Context: Scientists have discovered a new form of light
New form of light: The angular momentum of each photon (a particle of visible light) takes only half of this value
Earlier: In all forms of light, the angular momentum would be a multiple of Planck’s constant
Planck’s constant: The physical constant that sets the scale of quantum effects
Experiment by: William Rowan Hamilton and physicist Humphrey Lloyd
Effect: Creates impact on fundamental understanding of light, enable strange new possibilities of particles whose quantum numbers were fractions of those expected