First slide

The optical instruments

Question

In an astronomical telescope, the focal length of objective lens and eye-piece are 150 cm and 6 cm respectively. In case when final image is formed at least distance of distinct vision. the magnifying power is

Moderate

A

20
B

30
C

60
D

15

Solution

$m = \frac{f_{o}}{f_{e}} (1 + \frac{f_{e}}{D}) = \frac{150}{6} (1 + \frac{6}{25}) = 31$

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