First slide

The optical instruments

Question

The length of the tube of a microscope is 10 cm. The focal lengths of the objective and eye lenses are 0.5 cm and 1.0 cm. The magnifying power of the microscope is about

Moderate

A

5
B

23
C

166
D

500

Solution

$m ≃ \frac{LD}{f_{\infty} f_{e}} \Rightarrow m = \frac{10 \times 25}{0 .5 \times 1} = 500$

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