Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. [1][2] Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. In its simplest form, quantum theory describes light as consisting of discrete packets of energy, called photons. However, neither a classical wave model nor a classical particle model correctly describes light; light has a dual nature that is revealed only in quantum mechanics. What is Light? Light in Physics is a type of energy that enables us to see with our eyes. Light travels from a source, like the sun or a light bulb, to our eyes, and to the surroundings. That is the reason we can see objects during daytime with the sunlight, or with a light bulb in the night. The meaning of LIGHT is something that makes vision possible. How to use light in a sentence. Synonym Discussion of Light. Due to its finite speed, sunlight takes 8 minutes and 10 to 27 seconds to reach Earth, depending on the time of year. [1] The speed of light is the speed of electromagnetic waves. Light travels at slower speed inside materials like glass or water; its highest speed is in a vacuum. For related background details, please refer to our report on chevy truck fuse box diagram. In his formulation of electromagnetism, Maxwell described light as a propagating wave of electric and magnetic fields. More generally, he predicted the existence of electromagnetic radiation: coupled electric and magnetic fields traveling as waves at a speed equal to the known speed of light. And our entire understanding of the interaction of light and matter requires light to act like particles known as photons. Perhaps the easiest way to think of light is as a stream of particles, but quantum particles, which are unlike ones that we can see.

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