Question:medium
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
Updated On: Apr 23, 2026
- small focal length and large diameter
- large focal length and large diameter
- large focal length and small diameter
- small focal length and small diameter
Show Solution
The Correct Option is C
Solution and Explanation
Astronomical telescopes are designed to achieve high magnification and high resolution.
High magnification requires a large focal length of the objective lens.
High resolution and better light-gathering ability require a large aperture (diameter).
Therefore, the objective lens should have large focal length and large diameter.
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