reflectors
8.2 meter-miles
reflectors
The largest optical telescope in the world today is the Gran Telescopio Canarias (Grand Canary Telescope) in Spain, with an effective diameter of 10.4 meters. The world's largest individual radio telescope is the RATAN-600 in Russia, with the effective diameter of a 600 meter dish.
The Keck Observatory in Hawaii is a 10 meter optical telescope. Even larger is the Great Canary Telescope off the coast of Africa (west of Morocco) at 10.4 meters. EU scientists have requested permission to build a 40 meter optical telescope. The largest single radiotelescope dish is Arecibo.
Mirrors, The Hubble space telescope first had one big shaped mirror, which made the images blury so they sent up astronaughts and replaced it with 4 8.2 meter flat mirrors making the pictures more clear!
There are two very similar 10-meter telescopes at the W.M. Keck Observatory on Mauna Kea, on the Big Island of Hawaii.
Arecibo
The light gathering power is directly proportional to the light gathering area, so all you have to do is figure out the ratio of the areas of the two scopes. Another answer: Do you remember fourth grade arithmetic? Do you remember pi r square?
The ratio of the area is (60 / 10) squared, or 36.
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The largest reflecting telescope in Asia is located at the National Astronomical Observatory of Japan in Okayama Prefecture. It is known as the Subaru Telescope and has a primary mirror that measures 8.2 meters (27 feet) in diameter.
The area of any circle is (pi) x (radius)2 .A 2-meter telescope has a radius of 1 meter. So its area is(pi) x (1)2 = 3.1416 square meters = about 33.8 square feet.