Rankers Physics

Miscellaneous: Practice Problem & Solution

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of (2018)
Large focal length and large diameter
Large focal length and small diameter
Small focal length and large diameter
Small focal length and small diameter

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Miscellaneous. Understanding the underlying formula is key to arriving at the correct answer below:

Angular magnification is $M = \frac{f_o}{f_e}$, requiring a large focal length $f_o$ for the objective. Angular resolution is inversely proportional to the resolving limit $\Delta\theta = \frac{1.22\lambda}{D}$, requiring a large aperture diameter $D$ for high resolution.

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