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(astronomy, telescopy) The minimum angular separation of two sources that can be distinguished by a telescope (depending on the wavelength of the light being observed and the diameter of the telescope).

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diffraction limit

Even with a perfectly polished mirror, the diffraction limit prevents the telescope from resolving binary stars that lie too close to each other.

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Even with a perfectly polished mirror, the diffraction limit prevents the telescope from resolving binary stars that lie too close to each other.

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