NEET · Physics · STD 12 - 9. Ray optics and optical instruments
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
- A small focal length and large diameter
- B large focal length and small diameter
- C small focal length and small diameter
- D large focal length and large diameter
Answer & Solution
Correct Answer
(D) large focal length and large diameter
Step-by-step Solution
Detailed explanation
For telescope, angular magnification \(=\frac{f_{0}}{f_{e}}\) Angular resolution \(=\frac{D}{1.22 \lambda}\) should be large.
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