First slide

Ray optics

Question

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

Easy

A

small focal length and large diameter
B

large focal length and small diameter
C

large focal length and large diameter
D

small focal length and small diameter

Solution

$For telescope, angular magnification = \frac{f_{0}}{f_{e}}$
$Angular resolution = \frac{D}{1.22 λ} should be large.$
So, objective lens should have large focal length $(f_{0})$ and large diameter D for large angular magnification and high angular resolution.

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