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Each Na + is coordinated by an octahedron of two hydroxyl oxygens and four water molecules, with an average distance of 2.42 Å (Clark and Appleman 1964). [19] The octahedral and polyhedral chains parallel to c, the elongate direction, cause the fibrous habit of ulexite and the fiber optical properties.
Fiber optic technology is also used in holiday lighting, especially by incorporating it into artificial Christmas trees. Incandescent lamps or LEDs are located in the tree base and many optic fibers extend from the lamps to the ends of the tree branches. [4] [citation needed]
Structure of KTP crystal, viewed down b axis, used in second harmonic generation.. Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization density P responds non-linearly to the electric field E of the light.
A colorful sky is often due to indirect sunlight being scattered off air molecules and particulates, like smog, soot, and cloud droplets, as shown in this photo of a sunset during the October 2007 California wildfires. Atmospheric optics is "the study of the optical characteristics of the atmosphere or products of atmospheric processes ....
Rayleigh scattering, too, can be considered to be due to fluctuations in the density, composition and orientation of molecules within the transmitting medium, and hence of its refraction index, in small volumes of matter (particularly in gases or liquids). The difference is that Rayleigh scattering involves only the random and incoherent ...
It happens because of something called the Rayleigh effect, or Rayleigh scattering, named after a British scientist who first wrote about it in 1871. Bands of vivid blue, pink and orange light are ...
A pre-lit tree is an artificial Christmas tree which is pre-wired with Christmas lights. The lights are wrapped around the tree before it is sold, reducing set up time and making storage simpler. The lights cannot usually be removed from the tree because they are normally embedded within the artificial branches.
The aurora is expected to be bright and visible in multiple northern U.S. states Oct. 3 through Oct. 5 as well as from the lower Midwest to Oregon.
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