A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since
A large aperture contributes to the quality and visibility of the images.
A large area of the objective ensures better light gathering power.
A large aperture provides a better resolution.
All of the above
With larger aperture of objective lens, the light gathering power in telescope is high. Also, the resolving power or the ability to observe two objects distinctly also depends on the diameter of the objective. Thus objective of large diameter is preferred. Also, with large diameters fainter objects can be observed. Hence it also contributes to the better quality and visibility of images. Hence, all options are correct.
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