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2. Light - Wikipedia

   en.wikipedia.org/wiki/Light

   [4] [5] In this sense, gamma rays, X-rays, microwaves and radio waves are also light. The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization. Its speed in vacuum, 299 792 458 m/s, is one of the fundamental constants of nature. [6]

3. Double-slit experiment - Wikipedia

   en.wikipedia.org/wiki/Double-slit_experiment

   The Englert–Greenberger duality relation provides a detailed treatment of the mathematics of double-slit interference in the context of quantum mechanics. A low-intensity double-slit experiment was first performed by G. I. Taylor in 1909, [23] by reducing the level of incident light until photon emission/absorption events were mostly non ...

4. Michelson–Morley experiment - Wikipedia

   en.wikipedia.org/wiki/Michelson–Morley_experiment

   Because the speed of light is so great, and because material bodies pass through the aether without obvious friction or drag, it was assumed to have a highly unusual combination of properties. Designing experiments to investigate these properties was a high priority of 19th-century physics. [A 5]: 411ff

5. Illumination problem - Wikipedia

   en.wikipedia.org/wiki/Illumination_problem

   In 1997, two different 24-sided rooms with the same properties were put forward by George Tokarsky and David Castro separately. [ 3 ] [ 4 ] In 2016, Samuel Lelièvre, Thierry Monteil, and Barak Weiss showed that a light source in a polygonal room whose angles (in degrees) are all rational numbers will illuminate the entire polygon, with the ...

6. Fermat's principle - Wikipedia

   en.wikipedia.org/wiki/Fermat's_principle

   Fermat's principle is most familiar, however, in the case of visible light: it is the link between geometrical optics, which describes certain optical phenomena in terms of rays, and the wave theory of light, which explains the same phenomena on the hypothesis that light consists of waves.

7. Optics - Wikipedia

   en.wikipedia.org/wiki/Optics

   Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. [1] Optics usually describes the behaviour of visible , ultraviolet , and infrared light.

8. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. General relativity - Wikipedia

   en.wikipedia.org/wiki/General_relativity

   Deflection of light (sent out from the location shown in blue) near a compact body (shown in gray) General relativity predicts that the path of light will follow the curvature of spacetime as it passes near a massive object. This effect was initially confirmed by observing the light of stars or distant quasars being deflected as it passes the Sun.