Gregorian telescope

短语

格雷戈里望远镜

词形变化

Gregorian telescopes 复数 Gregorian telescopes

释义与例句

n.
  1. 1.

    A type of reflecting telescope having two concave mirrors: the primary mirror (a paraboloid) collects the light and brings it to a focus before the secondary mirror (a ellipsoid), where it is reflected back through a hole in the centre of the primary, and thence out the bottom end of the instrument, where it can be viewed with the aid of the eyepiece.

词汇关系

名词

上位词 2

reflector reflecting telescope

词源

Designed by Scottish mathematician and astronomer James Gregory in the 17th century.

来源：wiktionary