At what distance from a simple microscope must ... - WAEC Physics 1997 Question
At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?
A
2cm
B
3.3cm
C
4cm
D
5cm
correct option: c
M=(\frac {v}{u}=5\Rightarrow v=5u=20,let u be x\ v=5x if v=20 then 5x=20 therefore x=20/5=4,u=4cm)
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