For a telescope, larger the diameter of the objective lens
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A
The resolving power of a telescope is its ability to show two distant closely lying objects as just separate. The reciprocal of resolving power is the limit of resolution of the telescope.
Limit of resolution = 1.22 
rad
Where λ is wavelength and d the aperture (diameter). Hence, to reduce the limit of resolution of a telescope, we must use objective lens of large aperture . Larger the aperture of the objective lens, greater the resolving power of the telescope.
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