photons

Noun

photon (plural photons)

1. (particle) The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.
   • The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail.2013 July-August, Fenella Saunders, “Tiny Lenses See the Big Picture”, in American Scientist