Focal length of the objective and eyelenses of a telescope are 200 cm and 5 cm.&

Question

Focal length of the objective and eyelenses of a telescope are 200 cm and 5 cm. The maximum magnifying power of the telescope is

Options:

A . 40

B . 48

C . 60

D . 100

Answer: Option B
:
B

m = \frac{f_{0}}{f_{e}} [1 + \frac{f_{e}}{D}] m = \frac{200}{5} [1 + \frac{5}{25}] = 40 [1 + \frac{1}{5}] = 40 \times \frac{6}{5} = 8 \times 6 m = 48

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