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 telescope has a 10m mirror.
Keck Telescope on Mauna Kea in Hawaii
Reaching back in time, most people had just used their naked eye, but most recently as the telescope was invented, people had used and invented more and more telescopes. For example, the hubble telescope, the keck telescope, the arecibo radio telescope and so on.
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.
There are two very similar 10-meter telescopes at the W.M. Keck Observatory on Mauna Kea, on the Big Island of Hawaii.
1977
10 m
The telescopes' primary mirrors are 10 meters in diameter.