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2. Galileo's objective lens - Wikipedia

   en.wikipedia.org/wiki/Galileo's_objective_lens

   Galileo's objective lens. Galileo's objective lens is a specific objective lens held in the Museo Galileo, Florence, Italy. It was used by Galileo Galilei in the Galilean telescope with which he discovered the four largest moons of Jupiter in 1610. The lens has a diameter of 38mm and a gilt brass housing.

3. Galileoscope - Wikipedia

   en.wikipedia.org/wiki/Galileoscope

   Depending on the configuration, 4, 6 or 8 lenses are used. The 4-lens configuration results in a telescope in some ways similar to Galileo's, with 17× magnification and a very small field of view. The 6-lens configuration provides 25× magnification, and the 8-lens configuration allows for 50× magnification.

4. Refracting telescope - Wikipedia

   en.wikipedia.org/wiki/Refracting_telescope

   The design Galileo Galilei used c. 1609 is commonly called a Galilean telescope. [5] It used a convergent (plano-convex) objective lens and a divergent (plano-concave) eyepiece lens (Galileo, 1610). [6] A Galilean telescope, because the design has no intermediary focus, results in a non-inverted (i.e., upright) image. [7]

5. James Webb Space Telescope - Wikipedia

   en.wikipedia.org/wiki/James_Webb_Space_Telescope

   NASA compares the required accuracy by analogy: "If the Webb primary mirror were the size of the United States, each [mirror] segment would be the size of Texas, and the team would need to line the height of those Texas-sized segments up with each other to an accuracy of about 1.5 inches". [217] James Webb Space Telescope Mirror alignment ...

6. Optical telescope - Wikipedia

   en.wikipedia.org/wiki/Optical_telescope

   The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.

7. File:Comparison optical telescope primary mirrors.svg

   en.wikipedia.org/wiki/File:Comparison_optical...

   Comparison of optical telescope primary mirrors: Image title: Comparison of nominal sizes of primary mirrors of notable optical telescopes compared with some other telescopes and objects, by CMG Lee. Dotted lines show mirrors with equivalent light-gathering ability. Thanks to user at 71.41.210.146 for data on holes in mirrors. Width: 100% ...