Cassegrainian telescope

{
  "id": "MLC-T-MET-004192",
  "term": "Cassegrainian telescope",
  "field": "Meteorology and atmospheric science",
  "definition": "A type of reflecting telescope that uses a large concave primary mirror and a smaller convex secondary mirror to form an image. Light reflects from the primary mirror onto the secondary, which then reflects the light back through a hole in the center of the primary mirror to a focal point behind it. This folded optical path results in a compact instrument with a long focal length, making it suitable for atmospheric remote sensing instruments like lidar systems mounted on aircraft or satellites.",
  "url": "https://mlchart.com/terminology/meteorology/cassegrainian-telescope/"
}