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A photon is an elementary pairticle, the quantum o licht an aw ither furms o electromagnetic radiation, an the force carrier for the electromagnetic force, even when static via virtual photons. The effects o this force are easily observable at baith the microscopic an macroscopic level, acause the photon haes zero rest mass; this allaes lang distance interactions. Lik aw elementary pairticles, photons are currently best explained bi quantum mechanics an exhibit wave–pairticle duality, exhibitin properties o baith waves an pairticles. For example, a single photon mey be refractit bi a lens or exhibit wave interference wi itself, but an aa act as a pairticle givin a definite result when its poseetion is measured.