Galilean-telescope
noun
1.
a refracting telescope that forms an erect image, consisting of an objective of relatively long focal length that causes light rays to converge and an eyepiece of short focal length that causes them to diverge.
/ˌɡælɪˈleɪən/
noun
1.
a type of telescope with a convex objective lens and a concave eyepiece; it produces an erect image and is suitable for terrestrial use
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