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2. Transitions Optical - Wikipedia

   en.wikipedia.org/wiki/Transitions_Optical

   Transitions Optical is a U.S.-based company known for manufacturing photochromic lenses, which darken on exposure to specific types of light. The company was founded in 1990. [1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [2]

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. Home Depot - Wikipedia

   en.wikipedia.org/wiki/Home_Depot

   This is an accepted version of this page This is the latest accepted revision, reviewed on 12 February 2025. American multinational home improvement supplies retailing company The Home Depot, Inc. A Home Depot in Onalaska, Wisconsin Company type Public Traded as NYSE: HD DJIA component S&P 100 component S&P 500 component Industry Retail (home improvement) Founded February 6, 1978 ; 47 years ...

5. Pentamirror - Wikipedia

   en.wikipedia.org/wiki/Pentamirror

   A roof pentamirror contains 3 mirrors. A pentamirror is an optical device used in the viewfinder systems of various single-lens reflex cameras instead of the pentaprism.It is used to reverse again the laterally reversed image coming from the reflex mirror.

6. Focal length - Wikipedia

   en.wikipedia.org/wiki/Focal_length

   The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

7. Chirped mirror - Wikipedia

   en.wikipedia.org/wiki/Chirped_mirror

   The dielectric mirror is made of transparent materials that are uniformly layered at a depth of 1/4 the wavelength of light the dielectric mirror is designed to reflect. In addition, the amplitude reflection coefficients for the interfaces have alternating signs, hence all reflected components from the interfaces interfere constructively, which ...