Question:
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 24, 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
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The Correct Option is C
Solution and Explanation
Angular magnification of a refracting telescope is given by:
\[ M = \frac{f_o}{f_e} \]
For large angular magnification, the focal length of the objective lens \( f_o \) should be large.
Angular resolution is given by:
\[ \theta = \frac{1.22 \lambda}{D} \]
For high resolving power, the diameter \( D \) of the objective lens should be large.
Thus, a good astronomical telescope requires large focal length and large diameter.
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