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Zaccharias Janssen and his son Hans discovered that with several lenses in a tube nearby objects appeared greatly enlarged.
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Leeuwenhoek WAS A DUTCH MERCHANT WHO EXPERIMENTED WITH GRINDING OF LENSES He was able to polish lenses of great curvature that obtained a magnification of
nearly 300 TIMES -
ROBERT HOOK USED A CRUDE MICROSCOPE TO OBSERVE A THIN SLICE OF CORK AND HIS THE FIRST TO USE CELL TO DESCRIBE THE SMALLEST UNIT ON EARTH
