First slide

The optical instruments

Question

An astronomical telescope has objective and eye-piece lens of powers 0.5 D and 20 D respectively, its magnifying power will be

Moderate

A

8
B

20
C

30
D

40

Solution

$M = \frac{f_{o}}{f_{e}} = \frac{P_{e}}{P_{o}} = \frac{20}{0 .5} = 40$

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