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2. Photochromism - Wikipedia

   en.wikipedia.org/wiki/Photochromism

   Photochromism is the reversible change of color upon exposure to light. It is a transformation of a chemical species ( photoswitch ) between two forms by the absorption of electromagnetic radiation ( photoisomerization ), where the two forms have different absorption spectra.

3. Photochromic lens - Wikipedia

   en.wikipedia.org/wiki/Photochromic_lens

   A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation.

4. Helmholtz reciprocity - Wikipedia

   en.wikipedia.org/wiki/Helmholtz_reciprocity

   The Helmholtz reciprocity principle describes how a ray of light and its reverse ray encounter matched optical adventures, such as reflections, refractions, and absorptions in a passive medium, or at an interface.

5. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Oversized sunglasses, because of their larger frames and lenses, are useful for individuals who are trying to minimize the apparent size or arch of their nose. Oversized sunglasses also offer more protection from sunburn due to the larger areas of skin they cover, although sunblock should still be used.

6. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Optical coating - Wikipedia

   en.wikipedia.org/wiki/Optical_coating

   A woman wears sunglasses featuring a highly reflective optical coating Diagram of a dielectric mirror. Thin layers with a high refractive index n 1 are interleaved with thicker layers with a lower refractive index n 2. The path lengths l A and l B differ by exactly one wavelength, which leads to constructive interference.

8. 12 Stunning Pairs of Sunglasses for Every Face Shape ... - AOL

   www.aol.com/12-stunning-pairs-sunglasses-every...

   Us Weekly has affiliate partnerships so we may receive compensation for some links to products and services. Have you ever seen a celebrity or even a friend wearing a pair of sunglasses that you ...

9. Optical aberration - Wikipedia

   en.wikipedia.org/wiki/Optical_aberration

   The component S1 of the system, situated between the aperture stop and the object O, projects an image of the diaphragm, termed by Abbe the entrance pupil; the exit pupil is the image formed by the component S2, which is placed behind the aperture stop. All rays which issue from O and pass through the aperture stop also pass through the ...