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A spherometer is an instrument used for the precise measurement of the radius of curvature of a curved surface. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens .
Lens clock. A lens clock is a mechanical dial indicator that is used to measure the dioptric power of a lens.It is a specialized version of a spherometer.A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.
Animal Farm is a satirical allegorical novella, in the form of a beast fable, [1] by George Orwell, first published in England on 17 August 1945. [2] [3] It tells the story of a group of anthropomorphic farm animals who rebel against their human farmer, hoping to create a society where the animals can be equal, free, and happy.
Animal Farm [1] is an English-language opera by Russian composer Alexander Raskatov based on George Orwell's 1944 novella of the same name.The opera contains two acts, nine scenes, and an epilogue, with a libretto written by Ian Burton and musical direction by Bassem Akiki.
Squealer is a fictional character, a pig, in George Orwell's 1945 novel Animal Farm.He serves as second-in-command to Napoleon and is the farm's minister of propaganda.He is described in the book as an effective and very convincing orator and a fat porker.
Napoleon is a fictional character and the main antagonist of George Orwell's 1945 novella Animal Farm. [2] While he is at first a common farm pig, he exiles Snowball, another pig, who is his rival for power, and then takes advantage of the animals' uprising against their masters to eventually become the tyrannical "President" of Animal Farm, which he turns into a dictatorship, eventually ...
On top is a depiction of a perfect lens without spherical aberration: all incoming rays are focused in the focal point. The bottom example depicts a real lens with spherical surfaces, which produces spherical aberration: The different rays do not meet after the lens in one focal point.
Benjamin is a donkey in George Orwell's 1945 novel Animal Farm. [1] He is also the oldest of all the animals (he is alive in the last scene of the novel). He is less straightforward than most characters in the novel, and a number of interpretations have been put forward to which social class he represents as regards to the Russian Revolution ...