A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since : (NEET 2021 Exam Physics Section)

(A) a large aperture contributes to the quality and visibility of the images. 

(B) a large area of the objective ensures better light gathering power. 

(C) a large aperture provides a better resolution. 

(D) all of the above.

Solution: D

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since a large aperture provide better resolution and contributes to the quality and visibility of the images. A large area of the objective ensures better light gathering power. 

Hence, option (D) is correct.

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