An astronomical telescope has a large aperture to (a) reduce spherical aberration
An astronomical telescope has a large aperture to
(a) reduce spherical aberration
(b) have high resolution
(c) increases span of observation
(d) have low dispersion
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(b) The aperture of objective lens of Astronomical telescope is large to get better resolution. Since resolution of telescope power is R = D/1.22 λ , where D is the diameter of the objective lens of Telescope.
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