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An astronomical refracting telescope wil...

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

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

Text Solution

Verified by Experts

The correct Answer is:
A
For telescope , angular magnification `=(f_(0))/(f_(E))`
So, focal length of objective lens should be large .
Angular resolution `=(D)/(1.22 lambda)` should be large.
So, objective should have large focal length `(f_(0))` and large diameter D.
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