The Challenge: Make a Microscope 
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How
can we determine the magnifying power?
The smaller the size
of the sphere, the greater its magnifying power.
This equation is used:
I = 333/d where I is the magnifying power and d is the diameter of the
sphere in mm.
Therefore, we can
work out the magnification of these spheres:
A sphere of 1.66mm
in diameter =
200X
A sphere of 3.33mm
in diameter = 100X
A sphere of 1.11mm
in diameter = 300X
Turning the lens into a usable microscope
