Q. A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
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.
Explanation
[Solution] A large aperture gathers more light, improves resolution and image quality, and a large focal length gives higher magnification. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.