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


 

Option: 1

A large aperture contributes to the quality and visibility of image.
 


Option: 2

A large area of the objective ensures better light  gathering power.
 


Option: 3

a large aperture provides a better resolution

 


Option: 4

all of the above


Answers (1)

best_answer

Magnification of telescope=\frac{f_{o}}{\mu _{o}}=f_{o}\left [ \frac{1}{fe}+\frac{1}{Ve} \right ]

Large focal lenght\rightarrowbetter Magnification

Large opertare\rightarrowbetter light gathering power

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