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Visible light is electromagnetic radiation detectable by the human eye, usually defined as 400–700 nm (about 750–420 THz).
Visible light is electromagnetic radiation that the human eye can perceive. It occupies the visible spectrum, typically defined as wavelengths from about 400–700 nm (corresponding to frequencies roughly 750–420 THz). Visible light lies between infrared (longer wavelengths, lower frequencies) and ultraviolet (shorter wavelengths, higher frequencies), and is part of the broader category of optical radiation. More generally, the electromagnetic spectrum is classified by wavelength into radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The behavior of electromagnetic radiation depends on its wavelength and the energy carried per quantum (photon). In the visible range, photon energies are sufficient to trigger molecular changes in the eye (retinal), producing vision. Below the visible range, infrared photons are generally too low in energy to cause the needed molecular change, while above it, ultraviolet is largely blocked by the cornea and lens and can damage retinal cells; some animals can detect infrared or ultraviolet via different biological mechanisms. Light’s key properties include intensity, direction of propagation, wavelength/frequency spectrum, and polarization. In vacuum, all electromagnetic radiation travels at the speed of light, exactly 299,792,458 m/s. Although everyday light interactions can often be explained with geometrical optics, electromagnetic radiation also exhibits wave–particle duality: it can be described using wave behavior (e.g., interference) and photon behavior (e.g., detection with specialized equipment).
Visible light is electromagnetic radiation detectable by the human eye, usually defined as 400–700 nm (about 750–420 THz).
The visible band sits between infrared and ultraviolet within the optical radiation region of the electromagnetic spectrum.
Photon energy determines biological effects: visible photons can trigger retinal molecular changes, while infrared is typically too low in energy and ultraviolet is largely blocked or harmful to human eyes.
Light travels at the speed of light in vacuum (exactly 299,792,458 m/s) and exhibits both wave and particle characteristics, with photons as quanta of light.
The portion of the electromagnetic spectrum that human eyes can perceive, typically spanning wavelengths of about 400–700 nm.
The full range of electromagnetic radiation classified by wavelength, including radio waves through microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
A massless quantum of electromagnetic radiation that carries energy proportional to its frequency.
Electromagnetic radiation with wavelengths longer than visible light, generally too low in photon energy to trigger the retinal molecular change responsible for human vision.
Electromagnetic radiation with wavelengths shorter than visible light, largely absorbed by the cornea and lens and capable of damaging retinal cells.
The principle that electromagnetic radiation can exhibit both wave-like behavior (e.g., interference) and particle-like behavior (e.g., photon detection), depending on the context.
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