They are optical telescopes.
I have no idea and it does not even say it in the textbook
Keck telescopes do not exist, Keck telescope refers to the WM Keck Observatory on Mt. Kea.The Keck Observatory is comprised of several opticalreflecting telescopes, whereas aradio telescope consists of a large parabolic solid metal or screen reflector with a radioreceiver at its focus, built to detect and measure radio waves.
keck telescopes 1,2 tie the records for the largest telscopes in the world
keck telescopes 1,2 tie the records for the largest telscopes in the world
The Keck Observatory is located near the summit of Mauna Kea on the Big Island of Hawaii. It consists of two telescopes, Keck I and Keck II, which are among the largest and most scientifically productive telescopes in the world.
There are two very similar 10-meter telescopes at the W.M. Keck Observatory on Mauna Kea, on the Big Island of Hawaii.
The Hubble Space Telescope (HST) is an example of an optical telescope, as are the Keck Observatory on Mauna Kea, Hawaii. the Hale Telescope at the Palomar Observatory in California and the Hooker 100 inch Telescope at the Mt Wilson Observatory, also California.
Keck Telescope on Mauna Kea in Hawaii
This best answer describes a reflecting telescope. The maximum size for a refractor on Earth is about 40 inches due to gravitational sag. Palomar's primary mirror is some 16 feet in diameter, and the Keck telescopes use several large mirrors that are computer-controlled and act as a single disk twice the size of Palomar.
1977
10 m
The telescopes' primary mirrors are 10 meters in diameter.