Definition: Tropostereoscope is a type of telescope that uses mirrors to create an image on a screen. It was invented in 1764 by French scientist Joseph-Louis Lagrange and is often used for astronomical observations. The lens of the telescope consists of two large mirrors, one at each end of the tube, which are arranged so that they can be aligned to form a perfect circle. This allows the telescopes to focus light onto a screen or mirror, which then produces an image
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