Q 12-09-014NEETNEET 2021Top questionEasy
A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :
Answer: (D) all of the above.
A large aperture collects more light (brighter images of faint objects) and gives better resolving power (resolution $\propto D/\lambda$). Both improve the quality and visibility of the image, and a large focal length gives a high magnification ($f_o/f_e$).
All the statements are true.
Solution by Sreeraj P, M.Sc Physics