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This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
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.
Electromagnetic waves of different frequency are called by different names since they have different sources and effects on matter. In order of increasing frequency and decreasing wavelength, the electromagnetic spectrum includes: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
White light is dispersed by a prism into the colors of the visible spectrum. The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light (or simply light). The optical spectrum is sometimes considered to be the same as the ...
Aberration of light: light from a distant source appears to be from a different location for a moving telescope due to the finite speed of light. Another method is to use the aberration of light, discovered and explained by James Bradley in the 18th century.
Coherence (physics) In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. [1] : 286 Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent . When interfering, two waves add together to ...
List of brightest natural objects in the sky. List of brightest stars. Stellar corona. STEVE. Sun. Sunlight. Supernova. List of supernova remnants. Swedish torch.
Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings.
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