Zacharias
Janssen

1580-1638


Dutch maker of spectacles who invented the first compound microscope in 1590 (a compound microscope is one which has more than one lens). The lens in the eyepiece was bi-convex (bulging outwards on both sides), and the lens of the far end (the objective lens) was plano-convex (flat on one side and bulging outwards on the other side). This advanced microscope had a 3 to 9 times power of magnification.

In 1608 he made the first telescope together with Hans Lippershey.
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