Biology Unit (Life Science)                           Sept 15

1.History

What is a lens?  

…. A curved piece of glass, plastic, water… that is used to magnify images.   Can also concentrate light and make things far away look closer.

Important Inventors:

Galileo Galilei – 1600 – made a telescope with lenses

Janssen Brothers – 1590 – two lens microscope (compound)

Anton van Leeuwenhoek 1700

– better microscope with better lenses

– looked at “beasties” found in water

Robert Hooke (late 1600)

- looked  at a tree bark (cork) and saw box shaped parts he called Cells (used a compound microscope)

Parts of a Microscope