First slide

The optical instruments

Question

Least distance of distinct vision is 25 cm. Magnifying power of simple microscope of focal length 5 cm is

Moderate

A

$\frac{1}{5}$
B

5
C

$\frac{1}{6}$
D

6

Solution

In general, the simple microscope is used with image at D, hence
$m = 1 + \frac{D}{f} = 1 + \frac{25}{5} = 6$

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