First slide

The optical instruments

Question

In an astronomical telescope, the focal length of the objective lens is 100 cm and of eye-piece is 2 cm. The magnifying power of the telescope for the normal eye is

Moderate

A

50
B

10
C

100
D

$\frac{1}{50}$

Solution

$m = - \frac{f_{o}}{f_{e}} = - \frac{100}{2} = - 50$

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