light is the portion of electromagnetic radiation that is visible to the human eye, responsible for the sense of sight. Visible light has a wavelength in a range from about 380 or 400 nanometres to about 760 or 780 nm, with a frequency range of about 405 THz to 790 THz. In physics, the term light often comprises the adjacent radiation regions of infrared (at lower frequencies) and ultraviolet (at higher), not visible to the human eye. The term light has been used in spirituality (vision, enlightenment, darshan, Tabor Light). Bible commentators such as Ritenbaugh see the presence of light as a metaphor of truth, good and evil, knowledge and ignorance.
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