noun
Galilean telescope
A refracting telescope design attributed to Galileo, using a convex objective and a concave eyepiece to produce an upright image.
ガリレイ式望遠鏡は、凸レンズと凹レンズを組み合わせたシンプルな構造です。
The Galilean telescope has a simple structure combining a convex lens and a concave lens.
Keplerian telescope, which uses two convex lenses and produces an inverted image, unlike the upright image of the Galilean type.
Named after Galileo Galilei (ガリレイ), who improved and popularized this telescope design in the early 17th century.