Galilean telescope

American  

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.

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Galilean telescope British  

/ 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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Etymology

Origin of Galilean telescope

First recorded in 1715–25

Example Sentences

These telescopes were all made with a convex object-glass and a concave eye-lens, and this type is spoken of as the Galilean telescope.

From History of Astronomy by Forbes, George

It is this simple form of Galilean telescope that is still used in opera glasses and field glasses, because of the shorter tube necessary.

From Astronomy: The Science of the Heavenly Bodies by Todd, David Peck

An exactly similar principle is adopted in the construction of an opera-glass, which can be accurately described as a double Galilean telescope.

From The Astronomy of Milton's 'Paradise Lost' by Orchard, Thomas Nathaniel

In fact, his work in developing the instrument was so important that the telescope came gradually to be known as the "Galilean telescope."

From A History of Science — Volume 2 by Williams, Henry Smith