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In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a given point in space is specified by three numbers, ( r, θ, φ ): the radial distance of the radial line r connecting the point to the fixed point of origin (which is located on a fixed polar axis, or zenith direction axis ...
Various forms of eye exercises have been used for centuries. The concept of orthoptics was introduced in the late nineteenth century for the non-surgical treatment of strabismus. This early and traditional form of vision therapy was the foundation of what is now known as orthoptics and was based on observation not research or evidence.
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The corrections affected 10 articles that had been published from 2000 to 2003, with the errors reported to the newspaper after the scandal broke. [4] One 2007 study suggested that "fewer than 2 percent of factually flawed articles" in daily newspapers are actually followed by a correction.
Prism spectrometer. A prism spectrometer is an optical spectrometer which uses a dispersive prism as its dispersive element. The prism refracts light into its different colors ( wavelengths ). The dispersion occurs because the angle of refraction is dependent on the refractive index of the prism's material, which in turn is slightly dependent ...
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