First slide

The optical instruments

Question

An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm. The focal length of objective is

Moderate

A

2 cm
B

200 cm
C

$\frac{1}{2} cm$
D

$\frac{1}{200} cm$

Solution

$m = \frac{f_{o}}{f_{e}} \Rightarrow 10 = \frac{f_{o}}{20} \Rightarrow f_{0} = 200 cm$

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