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  2. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Beam of sun light inside the cavity of Rocca ill'Abissu at Fondachelli-Fantina, Sicily. The speed of light in vacuum is defined to be exactly 299 792 458 m/s (approximately 186,282 miles per second). The fixed value of the speed of light in SI units results from the fact that the metre is now defined in terms of the speed of light.

  3. List of light sources - Wikipedia

    en.wikipedia.org/wiki/List_of_light_sources

    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 ...

  4. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    An example of this phenomenon is when clean air scatters blue light more than red light, and so the midday sky appears blue (apart from the area around the Sun which appears white because the light is not scattered as much). The optical window is also referred to as the "visible window" because it overlaps the human visible response spectrum.

  5. Ray (optics) - Wikipedia

    en.wikipedia.org/wiki/Ray_(optics)

    A light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and may be curved in a medium in which the refractive index changes.

  6. World juniors USA vs. Finland: How to watch hockey gold-medal ...

    www.aol.com/world-juniors-usa-vs-finland...

    When is USA vs. Finland world juniors hockey game? The United States and Finland will play for gold at 7:30 p.m. ET at the Canadian Tire Centre in Ottawa.

  7. Luminosity - Wikipedia

    en.wikipedia.org/wiki/Luminosity

    Luminosity is an absolute measure of radiated electromagnetic energy per unit time, and is synonymous with the radiant power emitted by a light-emitting object. [ 1 ] [ 2 ] In astronomy , luminosity is the total amount of electromagnetic energy emitted per unit of time by a star , galaxy , or other astronomical objects .

  8. China's Huawei Technologies seeks dismissal of US criminal ...

    www.aol.com/news/chinas-huawei-technologies...

    Huawei Technologies asked a U.S. judge to dismiss much of a federal indictment accusing the Chinese telecommunications company of trying to steal technology secrets from U.S. rivals and misleading ...

  9. No further action in Alison Hammond blackmail case - AOL

    www.aol.com/no-further-action-alison-hammond...

    Prosecutors say they will take no further action against a man who was arrested on suspicion of blackmailing TV presenter Alison Hammond. A 36-year-old from Warwickshire was arrested and later ...

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