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  2. Light - Wikipedia

    en.wikipedia.org/wiki/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. Optical spectrometer - Wikipedia

    en.wikipedia.org/wiki/Optical_spectrometer

    The wavelength of light is then selected by the slit on the upper right corner. An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. [1]

  4. Optical instrument - Wikipedia

    en.wikipedia.org/wiki/Optical_instrument

    An illustration of some of the optical devices available for laboratory work in England in 1858. An optical instrument is a device that processes light waves (or photons), either to enhance an image for viewing or to analyze and determine their characteristic properties.

  5. Helmholtz reciprocity - Wikipedia

    en.wikipedia.org/wiki/Helmholtz_reciprocity

    If when the quantity of light i polarized in the plane a 1 proceeds from 1 in the direction of the given ray, that part k thereof of light polarized in a 2 arrives at 2, then, conversely, if the quantity of light i polarized in a 2 proceeds from 2, the same quantity of light k polarized in a 1 [Kirchhoff's published text here corrected by ...

  6. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    Light scattering in liquids and solids depends on the wavelength of the light being scattered. Limits to spatial scales of visibility (using white light) therefore arise, depending on the frequency of the light wave and the physical dimension (or spatial scale) of the scattering center. Visible light has a wavelength scale on the order of 0.5 μm.

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