LightSource
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. 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. The visible band sits adjacent to the infrared (with longer wavelengths and lower frequencies) and the ultraviolet (with shorter wavelengths and higher frequencies), called collectively optical radiation.
In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. This is why visible radiation is commonly termed visible light.
The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization. Its speed in vacuum, 299792458 m/s, is one of the fundamental constants of nature. All electromagnetic radiation exhibits some properties of both particles and waves. Single, massless elementary particles, or quanta, of light called photons can be detected with specialized equipment; phenomena like interference are described by waves. Most everyday interactions with light can be understood using geometrical optics. Quantum optics is an important research area in modern physics.
The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight.
Aurora
- 2026-02-27T00:00:00.000000Z
Ebb & Flow
- 2025-10-10T00:00:00.000000Z
Drive
- 2025-08-29T00:00:00.000000Z
Sunset City
- 2025-07-25T00:00:00.000000Z
Midnight Glow
- 2025-06-20T00:00:00.000000Z
Into The Grey
- 2025-05-16T00:00:00.000000Z
Let It Out
- 2025-03-28T00:00:00.000000Z
Neon Skies
- 2025-02-21T00:00:00.000000Z
Equuleus
- 2025-01-17T00:00:00.000000Z
Restored
- 2024-11-01T00:00:00.000000Z
Shooting Star
- 2024-09-27T00:00:00.000000Z
City Lights
- 2024-08-11T00:00:00.000000Z
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