sentence: Light exists in tiny packets called photons.
sentences_before: International Commission on Illumination 1987. CIE, 4th edition. Any radiation capable of causing a visual sensation directly. It is a small part of the electromagnetic spectrum and radiation given off by stars like the sun. Animals can also see light.
sentences_after: It shows properties of both waves and particles. The study of light, known as optics, is an important research area in modern physics.
concept_name: light
headings: Light