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Asked in NEET 2018 · Resolving power and limits of ray optics
Given: a refracting telescope wanted to have both large angular magnification and high angular resolution.
Idea: magnification and resolution depend on two different properties of the objective, so check each in turn.
Angular magnification M=(fₒ)/(fₑ), so a large objective focal length fₒ raises it.
Resolving power R=a/(1.22λ), where a is the objective's diameter.
A large diameter therefore raises the resolution, and the two requirements do not conflict.
The objective should have a large focal length and a large diameter.
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