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Published online by Cambridge University Press: 14 August 2015
Unprecedented activity exists in very high angular resolution astronomy at optical wavelengths. Applications of telescope arrays to modern problems have been described in publications too numerous to list here. For illustrative purposes, we shall here consider an array with a maximum baseline of 350 m corresponding to a limiting resolution at the first visibility null of about 0.3 milli-arcsec at 550 nm wavelength.