Egyptians |
~2600 B.C.E. |
rock crystal artifacts found in the shape of convex lenses |
Greeks and Romans |
~31 C.E. |
observed the magnification properties of water, used rock crystal convex lenses,
practiced glass blowing |
Arabian Alhazen |
(962 - 1038 C.E.) |
described the actions of the lenses in his treatise on optics called Optics
Thesaurus Alhazeni Arabius Basil |
Roger Bacon |
(1214-1292 C.E.) |
referred to the concepts and usages of lenses in his scientific works |
Ernst Leitz |
1873 C.E. |
introduced mircoscope with revolving nosepiece for objectives |
August Kohler |
~1880 C.E. |
figured out the optimum spacing for the light and condenser which would produce sharp
images |
Katherine Blodgett |
1917 C.E. |
developed micro-coatings which allowed her to develop non-reflecting
"invisible" glass |
Max Knoll and Ernst Ruska |
1931 C.E. |
built the first electron microscope |
Ernt Ruska |
1933 C.E. |
increases magnification of electron microscope to levels higher than a compound light
microscope |