An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

Question

Quantrex Academy · Accepted Answer

Correct answer: A. large focal length and large diameter

For astronomical refracting telescope

Angular magnification is more for large focal length

Of objective lens

\left(M . P = \dfrac{{f}_{0}}{{f}_{e}}\right)

Resolving power

= \dfrac{D}{1.22\lambda}

Resolving power is high for large diameter.

So, objective lens should have large focal length (f.) and large diameter D

An astronomical refracting telescope will have large angular...