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  2. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    [2] [3] In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. [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.

  3. Lightfastness - Wikipedia

    en.wikipedia.org/wiki/Lightfastness

    Lightfastness is a property of a colourant such as dye or pigment that describes its resistance to fading when exposed to light. [1] [2] [3] Dyes and pigments are used for example for dyeing of fabrics, plastics or other materials and manufacturing paints or printing inks.

  4. Diffuse reflection - Wikipedia

    en.wikipedia.org/wiki/Diffuse_reflection

    Polishing produces some specular reflection, but the remaining light continues to be diffusely reflected. The most general mechanism by which a surface gives diffuse reflection does not involve exactly the surface: most of the light is contributed by scattering centers beneath the surface, [2] [3] as illustrated in Figure 1

  5. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    By definition, visible light is the part of the EM spectrum the human eye is the most sensitive to. Visible light (and near-infrared light) is typically absorbed and emitted by electrons in molecules and atoms that move from one energy level to another. This action allows the chemical mechanisms that underlie human vision and plant photosynthesis.

  6. 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]

  7. Crystal optics - Wikipedia

    en.wikipedia.org/wiki/Crystal_optics

    This causes a rotation of the principal axes of the medium and alters the behaviour of light travelling through it; the effect can be used to produce light modulators. In response to a magnetic field , some materials can have a dielectric tensor that is complex- Hermitian ; this is called a gyro-magnetic or magneto-optic effect .

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  9. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    When light traveling in a dense medium hits a boundary at a steep angle, the light will be completely reflected. This effect, called total internal reflection, is used in optical fibers to confine light in the core. Light travels along the fiber bouncing back and forth off of the boundary.

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