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Microscope magnification
Arm
?
Base
?
Eyepiece lens
?
Low power lens   4 x (red)
?
High power lens 
40 X (blue)
Medium power lens   10 x (yellow) 
?
Barlow lens
?
High power lens  x40 (blue)
?
Low power lens
  x5 (red)
?
Angled eyepiece
tube
?
Medium power lens
  x10  (yellow)
?
USB PC eyepiece
?
Wrong answer =>
2 X
Barlow lens' magnification
?
objective    lens  power
?
To work out total magnification:

X
?
+
?
eyepiece    lens   power
=
?
      total 
magnification
?
Barlow lens
?
2
2
?
2
2
2
2
Objective
lens
?
10
?
10
40
40
?
4
4
?
Eyepiece
lens
16
16
16
?
5
5
?
5
=
Total magnification
?
1280
?
100
?
400
?
128
?
320
?
40
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