Abstract
The resolution of a telescope has a diffraction limit of ∼λ/D, where λ is the observing wavelength and D is the aperture diameter. The resolution of large optical telescopes is limited to about a half arc second by atmospheric fluctuations, although the diffraction limit is much smaller. However, for radio frequencies a diffraction limit of about 1 arc minute at the highest radio frequencies is currently reached using filled-aperture telescopes. Further significant increase of the resolution of filled-aperture telescopes is not likely.
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Fomalont, E.B., Wright, M.C.H. (1974). Interferometry and Aperture Synthesis. In: Verschuur, G.L., Kellermann, K.I. (eds) Galactic and Extra-Galactic Radio Astronomy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-96178-6_10
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