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2. Photochromism - Wikipedia

   en.wikipedia.org/wiki/Photochromism

   Photochromism. A photochromic eyeglass lens, after exposure to sunlight while part of the lens remained covered by paper. 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 ...

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. In the absence of activating light, the lenses return to their clear state.

4. List of ISO 3166 country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

   See the ISO 3166-3 standard for former country codes. British Virgin Islands – See Virgin Islands (British) . Burma – See Myanmar . Cape Verde – See Cabo Verde . Caribbean Netherlands – See Bonaire, Sint Eustatius and Saba . China, The Republic of – See Taiwan (Province of China) . Democratic People's Republic of Korea – See Korea ...

5. Photochrom - Wikipedia

   en.wikipedia.org/wiki/Photochrom

   Photochrom. Photochrom, Fotochrom, Photochrome [Note 1] [2] or the Aäc process is a process for producing colorized images from a single black-and-white photographic negative via the direct photographic transfer of the negative onto lithographic printing plates. The process is a photographic variant of chromolithography (color lithography).

6. Telephone numbers in Saudi Arabia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Saudi...

   940 - Saudi Municipal Services. 966 - Saudi Natural Disasters. 985 - Saudi General Intelligence Presidency. 989 - Saudi Public Security. 990 - Saudi Telephone Service for Security Issues. 992 - Saudi Passport. 993 - Saudi Traffic Police Force. 994 - Saudi Border Checkpoint. 995 - Saudi Anti-Narcotics.

7. List of universities and colleges in Saudi Arabia - Wikipedia

   en.wikipedia.org/wiki/List_of_universities_and...

   University/College Foundation City Website: Riyadh Region; King Saud University: 1957: Riyadh: www.ksu.edu.sa: Princess Nora bint Abdul Rahman University: 1970