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  2. History of the single-lens reflex camera - Wikipedia

    en.wikipedia.org/wiki/History_of_the_single-lens...

    The Photomic prism head later evolved to include the Photomic T with TTL in 1965, a behind-the-lens metering prism head which metered an averaging pattern of the focusing screen. The later center-area reading Photomic Tn, concentrated 60% of its sensitivity in the central portion of the focusing screen and the remaining 40% for the outlying ...

  3. Human eye - Wikipedia

    en.wikipedia.org/wiki/Human_eye

    The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance. Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer ...

  4. Macular degeneration - Wikipedia

    en.wikipedia.org/wiki/Macular_degeneration

    8.7% global prevalence in 2020 [2] Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field. [1] Early on there are often no symptoms. [1] Over time, however, some people experience a gradual worsening of vision that may ...

  5. List of inventors - Wikipedia

    en.wikipedia.org/wiki/List_of_inventors

    Augustin-Jean Fresnel (1788–1827), France – Fresnel lens; Amelia Freund (1824–1887), Germany – cooking stove contained a "frizzler" which fried without hardening. [4] Ida Freund (1863–1914), UK – gas measuring tube, periodic table cupcakes; William Friese-Greene (1855–1921), UK – cinematography

  6. Maxwell's equations - Wikipedia

    en.wikipedia.org/wiki/Maxwell's_equations

    Maxwell's equations, or Maxwell–Heaviside equations, are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, electric and magnetic circuits. The equations provide a mathematical model for electric, optical, and radio technologies, such ...

  7. Eigenvalues and eigenvectors - Wikipedia

    en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors

    Eigenvalues and eigenvectors. In linear algebra, an eigenvector (/ ˈaɪɡən -/ EYE-gən-) or characteristic vector is a vector that has its direction unchanged by a given linear transformation. More precisely, an eigenvector, , of a linear transformation, , is scaled by a constant factor, , when the linear transformation is applied to it: .

  8. Northrop B-2 Spirit - Wikipedia

    en.wikipedia.org/wiki/Northrop_B-2_Spirit

    The Northrop B-2 Spirit, also known as the Stealth Bomber, is an American heavy strategic bomber, featuring low-observable stealth technology designed to penetrate dense anti-aircraft defenses. A subsonic flying wing with a crew of two, the plane was designed by Northrop (later Northrop Grumman) as the prime contractor, with Boeing, Hughes, and ...

  9. Chevrolet Corvette - Wikipedia

    en.wikipedia.org/wiki/Chevrolet_Corvette

    The 1953, 1954, and 1955 model years were the only Corvettes equipped with a 235 cu in (3.9 L) version of the second-generation Blue Flame inline-six rated at 150 hp (112 kW; 152 PS). The 1955 model offered a 265 cu in (4.34 L) V8 engine as an option. The new V8 improved 0–60 mph (0–97 km/h) acceleration by 3 seconds.

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