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  2. Light tube - Wikipedia

    en.wikipedia.org/wiki/Light_tube

    The pipe is coated with a 99.3% specular reflective film and the distribution element at the end of the light pipe consists of a 4.6 m long diffusing radial film with an 87% visible transmittance. The light pipe introduces consistently illuminance levels ranging between 300 and 2,500 lux throughout the year at distances between 7.6 m to 10 m. [12]

  3. Liter of Light - Wikipedia

    en.wikipedia.org/wiki/Liter_of_Light

    Liter of Light Bangladesh was started by Shanjidul Alam Seban Shaan under Lights Foundation in 2015 in Chittagong. [14] [15] They made a local version of the bottle light called 'Botol Bati', which costs around $2–2.50 USD and lasts for 4–5 years. They aim to spread awareness of bottle lights to remote areas by training local school students.

  4. Caustic (optics) - Wikipedia

    en.wikipedia.org/wiki/Caustic_(optics)

    Caustics produced by a glass of water, visible as patches of light Cardioid caustic at the bottom of a teacup Caustics made by the surface of water Caustics in shallow water In optics , a caustic or caustic network [ 1 ] is the envelope of light rays which have been reflected or refracted by a curved surface or object, or the projection of that ...

  5. Dispersive prism - Wikipedia

    en.wikipedia.org/wiki/Dispersive_prism

    Photograph of a triangular prism, dispersing light Lamps as seen through a prism. In optics, a dispersive prism is an optical prism that is used to disperse light, that is, to separate light into its spectral components (the colors of the rainbow). Different wavelengths (colors) of light will be deflected by the prism at different angles. [1]

  6. Etendue - Wikipedia

    en.wikipedia.org/wiki/Etendue

    Etendue for a differential surface element in 2D (left) and 3D (right).. An infinitesimal surface element, dS, with normal n S is immersed in a medium of refractive index n.The surface is crossed by (or emits) light confined to a solid angle, dΩ, at an angle θ with the normal n S.

  7. Prism (optics) - Wikipedia

    en.wikipedia.org/wiki/Prism_(optics)

    Dispersive prisms are used to break up light into its constituent spectral colors because the refractive index depends on wavelength; the white light entering the prism is a mixture of different wavelengths, each of which gets bent slightly differently. Blue light is slowed more than red light and will therefore be bent more than red light.

  8. Dispersion (optics) - Wikipedia

    en.wikipedia.org/wiki/Dispersion_(optics)

    In a dispersive prism, material dispersion (a wavelength-dependent refractive index) causes different colors to refract at different angles, splitting white light into a spectrum. A compact fluorescent lamp seen through an Amici prism. Dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. [1]

  9. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    Diffuse reflection - Generally, when light strikes the surface of a (non-metallic and non-glassy) solid material, it bounces off in all directions due to multiple reflections by the microscopic irregularities inside the material (e.g., the grain boundaries of a polycrystalline material or the cell or fiber boundaries of an organic material ...

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