A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

Options

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

Answer

D

Explanation

All of the above
Magnification Power = `(f_(0))/(f_(e))`
Resolving power = `(a)/(1.22 lambda)`
Large aperture of the objective lens provides better resolution
`therefore` Good quality of image is formed and also it gathers more light.