The light from the unit telescopes can also be combined with that from the auxiliary telescopes, using a technique called interferometry, to give the effect of a single telescope as large as the entire array of individual telescopes. (scienceinschool.org)
The VLBA, a series of 10 individual telescopes located at sites across North America, can create, in effect, an enormous single telescope with an aperture thousands of kilometers wide, thus providing the resolution necessary to probe the relatively small region at the core of our galaxy. (public.nrao.edu)
Dr Roberto Gilmozzi: The Kecks are bigger as individual telescopes; the VLT however has twice as many telescopes and so the total collecting area of the VLT is larger than the total collecting area of the two Kecks. (news.bbc.co.uk)