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

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

NEETNEET 2018Ray Optics and Optical Instruments

Solution:

For telescope, angular magnification $=\frac{f_{0}}{f_{E}}$
So, focal length of objective lens should be large.
Angular resolution $=\frac{D}{1.22 \lambda}$ should be large.
So, objective should have large focal length $\left(f_{0}\right)$ and large diameter $D$.