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Angular Magnification in Telescope

The astronomi...

Question

The astronomical telescope has two lenses of focal powers $0.5 D$ and $20 D$ . Its magnifying power will be :

A

40

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B

30

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C

20

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D

10

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Solution

The correct option is A $40$
$f = \frac{100}{p} c m$
$f_{0} = \frac{100}{0.5} c m$
$f_{0} = 200 c m$
$f_{e} = \frac{100}{20} c m$
$= 5 c m$
$∴ m = \frac{f_{0}}{f_{e}}$
$= \frac{200}{5} c m$
$= 40 c m$

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