Astronomers prefer to use telescopes with large objective diameters to observe astronomical objects. why?

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:The resolving power of a telescope is more ,if the diameter of the objective lens is more. Reason:Objectives lens of large diameter collects more light.

An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm.

The objective with large aperture are used in telescope for

Which two main considerations arekept in mind while designing the objective of an astronomical telescope?

You are given the following three lenses. Which two lenses will you use as an eye piece and as an objective to construct an astronomical telescope? Give reasons.

What do you understand by elevation and angular distance between two stars ? How does angular measurement help us to determine. Size of astronomical objects and distances.

Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object ?