Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. The primary properties of visible light are intensity, propagation-direction, frequency or wavelength spectrum and polarization.
Its speed in a vacuum, 299 792 458 metres a second (m/s), is one of the fundamental constants of nature, as with all types of electromagnetic radiation (EMR), light is found in experimental conditions to always move at this speed in a vacuum.
The main source of light on Earth is the Sun.
Light consists of dual nature which means sometimes it behaves like a particle (known as photon), which explains how the light travels in straight lines. Sometimes light behaves as the wave, which explains how light bends (or diffract) around an object.
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