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Light, or visible light, is electromagnetic radiation of a wavelength that is visible to the human eye (about 400–700 nm), or up to 380–750 nm.[1] In the broader field of physics, light is often used to refer to electromagnetic radiation of all wavelengths, whether visible or not. Three primary properties of light are Light can exhibit properties of both waves and particles (photons). This property is referred to as wave–particle duality. The study of light, known as optics, is an important research area in modern physics. The speed of light in a vacuum is presently defined to be exactly 299,792,458 m/s (about 186,282.397 miles per second). This definition of the speed of light means that the metre is now defined in terms of the speed of light. The speed of light depends upon the nature of the medium in which it is traveling. Its speed is lower in a transparent substance than in a vacuum.
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