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Simple Microscope Angular Magnification

An astronomic...

Question

An astronomical telescope has a magnifying power 10. The focal length of the eye-piece is 20cm. The focal length of the objective is

A

2 cm

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B

200 cm

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C

5 cm

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D

30 cm

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Solution

The correct option is D 200 cm
$M = \frac{f_{o}}{f_{e}}$

$\Rightarrow f_{o} = 20 \times 10 = 200 c m$

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