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Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...
Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.
All motion pictures made and exhibited before 1929 are indisputably in the public domain in the United States. This date will move forward one year, every year, meaning that films released in 1929 will enter the public domain in 2025, films from 1930 in 2026, and so on, concluding with films from 1977 entering the public domain in 2073.
Tubi has all sorts of movies, from classics to modern hits, and genres like Western, Sci-Fi, Action, and more. Here are 15 great movies you can watch right now. 15 Free-to-Watch Movies on Tubi For ...
Corrective Measures. Corrective Measures is a 2022 American superhero film [ 4][ 5] written, produced and directed by Sean O'Reilly and starring Bruce Willis and Michael Rooker. [ 6] It is based on the graphic novel of the same name by Grant Chastain. [ 7] It is also O'Reilly's debut in a live-action feature film.
In optics, the Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects. It was formulated by Ernst Abbe in the context of microscopes. [ 1] The Abbe sine condition says that. the sine of the object-space angle should be ...
Chromatic aberration. Focal length of lens varies with the color of light. In optics, chromatic aberration ( CA ), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. [ 1][ 2] It is caused by dispersion: the refractive index of the lens elements ...
Eyepiece. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample.