The Cassegrain telescope is a reflecting telescope composed of two mirrors. It was invented by Cassegrain in 1672. The larger one is called the primary mirror, and the smaller one is called the secondary mirror. Usually a hole is opened in the center of the main mirror, and the image is formed behind the main mirror. Its focal point is called the Cassegrain focal point. Sometimes an oblique plane mirror is added as the dotted line in the figure, and the image is formed on the side. This Cassegrain telescope is also called the Nesmus telescope.
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