An astronomical telescope has a large aperture to (a) reduce spherical aberration (b) have high resolution (c) increase span of observation (d) have low dispersion

Answer: (b). RP = (D)/(1.22λ), so a larger aperture D gives higher resolving power (and more light). A larger aperture does not reduce spherical aberration or dispersion. So the answer is (b) have high resolution.

An astronomical telescope has a large aperture to | JEE Main 2002 (AIEEE)

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Optical Instruments & the Eye

An astronomical telescope has a large aperture to

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Answer: (b)

$RP = \dfrac{D}{1.22\lambda}$ , so a larger aperture $D$ gives higher resolving power (and more light).
A larger aperture does not reduce spherical aberration or dispersion.
So the answer is (b) have high resolution.

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