First slide

The optical instruments

Question

A simple magnifying lens is used in such a way that an image is formed at 25 cm away from the eye. In order to have 10 times magnification, the focal length of the lens should be

Moderate

A

5 cm
B

2 cm
C

25 mm
D

0.1 mm

Solution

$m = 1 + \frac{D}{f_{e}} \Rightarrow 10 = 1 + \frac{25}{f_{e}} \Rightarrow f_{ε} = \frac{25}{9} ≃ 25 mm$

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