First slide

The optical instruments

Question

The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm)

Moderate

A

10
B

0.1
C

62.5
D

11

Solution

$m_{max} = 1 + \frac{D}{f} = 1 + \frac{25}{2 .5} = 11$

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