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Limit of Resolution

An astronomic...

Question

An astronomical telescope has an eye piece of focal length 30 mm. In normal adjustment the separation between lenses is 540 mm, then, angular magnification of the telescope under consideration is

A

18

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B

19

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C

17

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D

11

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Solution

The correct option is C 17
$f_{o} + f_{e} = 540$ mm
$f_{o} = 540 - f_{e} = 540 - 30 = 510$ mm
$m = \frac{f_{o}}{f_{e}} = \frac{510}{30} = 17$

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