First slide

The optical instruments

Question

The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be

Moderate

A

– 40
B

– 48
C

– 60
D

– 100

Solution

Magnifying power of astronomical telescope
$m = - \frac{f_{0}}{f_{e}} (1 + \frac{f_{e}}{D}) = - \frac{200}{5} (1 + \frac{5}{25}) = - 48$

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