First slide

The optical instruments

Question

If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting then calculate the focal length of objective.

Moderate

A

100 cm
B

10 cm
C

20 cm
D

25 cm

Solution

$| m | = \frac{f_{o}}{f_{e}} = 20 and L = f_{o} + f_{e} = 105 \Rightarrow f_{o} = 100 cm$

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