- Antony van Leeuwenhoek
(1632-1723): made microscopes from simple lenses,
but could observe 200X.
- Robert Hooke
(1635-1703) made early compound microscope,
with eyepiece and objective lenses.
- Resolution
of a lens decreases (can see finer detail) as Numerical Aperture (N.A.) increases.
- Magnification (power) increases as N.A. increases.
- Total magnification of a compound microscope =
eyepiece power x objective power:Eyepiece power is usually 10x.
Objective power:
lens power N.A.* color Scanning power 4x 0.10 red Low power 10x 0.25 yellow High power 40x 0.65 blue Immersion oil 100x 1.25 white
(do not use)
