First slide

The optical instruments

Question

An astronomical telescope of ten-fold angular magnification has a length of 44 cm. The focal length of the objective is

Moderate

A

4 cm
B

40 cm
C

44 cm
D

440 cm

Solution

$L = f_{o} + f_{e} = 44 and | m | = \frac{f_{o}}{f_{e}} = 10 This gives f_{0} = 40 cm$

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