Constellation concave-convex mirror _ What does a concave-convex mirror look like?

The principle of astronomical telescope is the reflection of concave-convex mirror. After the light from the light source enters the objective lens, it narrows the distance and broadens the viewing angle, so it becomes an enlarged image, so that you can observe objects that are not clear to the naked eye.

Astronomical telescopes generally have two lens barrels, namely a main mirror and a star finder, in which the main mirror is used to observe the target and the star finder is used to find the target. Astronomical telescopes are mainly divided into three types: refractive telescope, catadioptric telescope and modern large telescope, among which the refractive telescope is galileo telescope and Kepler telescope, and the catadioptric telescope is Schmidt telescope, reflective telescope and Maksutov telescope.

The folding reflecting telescope of astronomical telescope has both refracting mirror and reflecting mirror. 193 1 year, the German optician Schmidt used a unique aspheric thin lens close to the parallel plate as a correction lens, and cooperated with a spherical reflector to make a Schmidt telescope that can eliminate spherical aberration and off-axis aberration. This kind of telescope has the advantages of strong light, large field of view and small aberration, and is suitable for taking large-area photos of the sky, especially for taking dim nebulae.