Best Objective for Astronomical Telescope – Rankers Physics
Topic: Ray Optics
Subtopic: Lens Makers Formula/ Len's Formula

Best Objective for Astronomical Telescope

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

Solution:

A larger aperture lens collects more light (better visibility and brightness), has a higher resolving power (better resolution), and hence satisfies all specified criteria.

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