First slide

The optical instruments

Question

The focal length of the objective and eye piece of a telescope are respectively 60 cm and 10 cm. The magnitude of the magnifying power when the image is formed at infinity is

Moderate

A

50
B

6
C

70
D

5

Solution

$m = \frac{f_{o}}{f_{e}} = \frac{60}{10} = 6$

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