A) Large focal length and large diameter
B) Large focal length and small diameter
C) Small focal length and large diameter
D) Small focal length and small diameter
Correct Answer: A
Solution :
For telescope, angular magnification\[\text{=}\frac{{{\text{f}}_{\text{0}}}}{{{\text{f}}_{\text{E}}}}\] 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 \[({{f}_{0}})\] and large diameter D.
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