Microscopes

A microscope is…

an instrument that produce images or pictures of small objects.

Brief History of Microscopes

~1590 Hans and Zacharias Janssen

Made the first compound microscopes

tube with lenses at each end

magnification ranged from 3X to 9X

Robert Hooke, 1635-1703 •Hooke's microscope magnified objects up to 30X

•Looked at slices of a cork, saw chambers and called them "cells“

•Wrote a book that helped lead to the discovery of bacteria

Anton van Leeuwenhoek, 1632-1723 •made simple (one lens), small microscopes that were the best ones for that time period (up to 90x)

•first person to describe bacteria •Discovered protozoans, •Helped to prove the theory of blood circulation.

2011

3 Main Types of Microscopes

Compound light microscope

Light passes through the specimen and produces a flat image

Images taken from a Compound Light Microscope

Transmission Electron Microscope (TEM)

•Electrons pass through the specimen and produce a flat image

Images taken from a TEM

Scanning Electron Microscope (SEM)

Electrons bounce off the surface of the specimen and produce a three-dimensional image

Images taken from a SEM

Review

Microscopes are instruments designed to produce images or pictures of small objects.

Zacharias Janssen was the first to build a compound microscope

Robert Hooke built a better microscope and with it discovered many things, including cells

Anton van Leeuwenhoek designed very small microscopes, but with them was able to discover bacteria, protozoans and he helped to prove the theory of blood circulation

The three types of microscopes are: Compound light microscope

Transmission Electron Microscope

Scanning Electron Microscope