First slide

The optical instruments

Question

A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is

Moderate

A

10
B

20
C

50
D

25

Solution

$m = m_{0} \times m_{e} \Rightarrow 100 = 5 \times m_{e} \Rightarrow m_{e} = 20$

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