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2. List of refractive indices - Wikipedia

   en.wikipedia.org/wiki/List_of_refractive_indices

   Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line , with a wavelength (λ) of 589 nanometers .

3. Lightguide display - Wikipedia

   en.wikipedia.org/wiki/Lightguide_display

   The Swedish electronic computer BESK, built in 1953, displayed 18 hexadecimal digits using edge-lit acrylic, the grey squares at the center of the green console. It contains a set of sandwiched acrylic or clear plastic panels, each of which is engraved with a numeral or character to be displayed.

4. Poly(methyl methacrylate) - Wikipedia

   en.wikipedia.org/wiki/Poly(methyl_methacrylate)

   PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can also be used as a casting resin, in inks and coatings, and for many ...

5. Light tube - Wikipedia

   en.wikipedia.org/wiki/Light_tube

   Total external reflection, hollow light tube Total internal reflection, block of acrylic. Light tubes (also known as solar pipes, tubular skylights or sun tunnels [1]) are structures that transmit or distribute natural or artificial light for the purpose of illumination and are examples of optical waveguides.

6. 'Good luck staying awake': This power lift recliner is $200 ...

   www.aol.com/lifestyle/good-luck-staying-awake...

   This power lift recliner is on sale for $200 off during Walmart's Presidents' Day sale. Find out why Walmart shoppers rave about this comfy chair.

7. Light and Space - Wikipedia

   en.wikipedia.org/wiki/Light_and_Space

   Whether by directing the flow of natural light, embedding artificial light within objects or architecture, or by playing with light through the use of transparent, translucent or reflective materials, Light and Space artists make the spectator's experience of light and other sensory phenomena under specific conditions the focus of their work. [2]