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The Color Purple is a 1982 epistolary novel by American author Alice Walker that won the 1983 Pulitzer Prize for Fiction and the National Book Award for Fiction. [1] [a]The novel has been the target of censors numerous times, and appears on the American Library Association list of the 100 Most Frequently Challenged Books of 2000–2010 at number seventeen because of the sometimes explicit ...
Motivated in part by its desire to prevent colour revolutions, in 2009 China banned YouTube, Twitter, and Facebook. [ 66 ] The 2015 policy white paper "China's Military Strategy" ( 中国的军事战略 ) by the State Council Information Office said that "anti-China forces have never given up their attempt to instigate a 'color revolution' in ...
The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...
Hypertropia is a condition of misalignment of the eyes (), whereby the visual axis of one eye is higher than the fellow fixating eye. Hypotropia is the similar condition, focus being on the eye with the visual axis lower than the fellow fixating eye.
Esotropia is a form of strabismus in which one or both eyes turn inward. The condition can be constantly present, or occur intermittently, and can give the affected individual a "cross-eyed" appearance. [1]
pH can be measured using indicators, which change color depending on the pH of the solution they are in. By comparing the color of a test solution to a standard color chart, the pH can be estimated to the nearest whole number. For more precise measurements, the color can be measured using a colorimeter or spectrophotometer.
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A roof prism, also called a Dachkanten prism or Dach prism (from German: Dachkante, lit. "roof edge"), is a reflective prism containing a section where two faces meet at a 90° angle, resembling the roof of a building and thus the name. Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces ...