- invented in 1500s and have 2 lenses
- Robert Hooke used them to discover cells using x30 magnification
- in 1675 eye pieces were improved by Leeuwenhoek
- resolution is smallest distance between 2 points before turns into 1 point
- light microscope can magnify uptp x1500 with resolution of 0.000 1mm
- electron microscope (1930s) builds up image by firing electrons. x2 000 000 magnification and 0.000 000 2mm resolution
- magnification = eye piece x eye lense
mm <- x1000 micrometer <- x1000 nanometer <- x1000 picometer
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