カセグレン望ぼう遠えん鏡きょう

noun

Cassegrain telescope

A type of reflecting telescope that uses a concave primary mirror and a convex secondary mirror to fold the optical path, resulting in a compact tube.

• カセグレン望ぼう遠えん鏡きょうは、鏡きょう筒とうが短みじかいので持もち運はこびに便べん利りだ。

  A Cassegrain telescope is portable because its tube is short.