First slide

The optical instruments

Question

In an astronomical telescope, the focal lengths of two lenses are 180 cm and 6 cm respectively. In normal adjustment, the magnifying power will be

Moderate

A

1080
B

200
C

30
D

186

Solution

$| m | = \frac{f_{o}}{f_{e}} = \frac{180}{6} = 30$

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