This presentation details the history of microscopes, beginning with magnifying glasses used by Romans in the 1st century AD. The first compound microscope was invented in the late 16th century by Hans and Zacharias Janssen. Anton van Leeuwenhoek made early improvements including more powerful single-lens microscopes. Robert Hooke popularized the microscope with his 1665 book Micrographia. Modern light microscopes were developed building on the early work of Janssen, Hooke, and van Leeuwenhoek using lenses and light, while electron microscopes use electron beams and produce higher magnifications under vacuum.

1. MICROSCOPES
BY: GANNA ELREFAEI
TO:MIS S MAINGI

2. INTRODUCTION
About what is this presentation? This presentation details you what a microscope is, who invented
the first microscope, all the scientists who helped in this instrument, and the difference between the
sorts of microscopes. Additionally, you will find a quiz and some key words.
I wish you a lot of fun in this Power Point.

3. MAGNIFYING GLASSES
• In the 1st
century ad (year 100), glass had been invented and the
Romans used the glass to look through it .they knew also how to
magnify (enlarge) an object. They discovered that you can focus the
rays of the sun with one of the special glasses called magnifying
glasses or burning glasses.
• The magnifying glasses were not used much until the end of 13th
century.

4. (1580 -1638) HANS AND ZACHARIAS JANSSEN
• Zacharias Janssen is a Dutch spectacle-maker
from Middleburg credited with inventing the first
microscope.
• Zacharias Janssen and his father (Hans) started
experimenting with Magnifying Glasses.
Many people believe that Hans played a big Rule in
investigating the compound Microscope.
I am the first creator of a
compound microscope

5. ANTON VAN LEEUWENHOEK
• Anton van Leeuwenhoek of Holland started as an apprentice in a dry goods
store.
• Van Leeuwenhoek's instruments consisted of simple powerful magnifying
glasses, rather than the compound microscopes (microscopes using more
than one lens) .
(1632 – 1723)(1632 – 1723)
He said: my work witch I have
done for a long time was not in
order to gain the praise. But to
help other people.

6. (1665) ……..ROBERT HOOKE…….
• The Englishman Robert Hooke was an architect, natural
philosopher and a best known for his law of elasticity.
• The Micrographia
You know what is meant by a
Micrographia a Micrographia is a
book written by me about the
insects under the microscopes .
The microscope of
Robert hook.

7. MODERN LIGHT MICROSCOPES
• The modern light microscope
was invented from Zacharias
Janssen and other scientist
(Robert Hooke, Anton van
Leeuwenhoek). All of them
played a vital role in the
development of modern
microscopes.

8. #ELECTRON MICROSCOPE# VS. #LIGHT MICROSCOPE#
Comparison Light microscope Electron microscope
Mechanism Depends on light Depends on electron
scattering
Image formation No vacuum High vacuum
Techniques Simple Advanced
Specimen preparation Normally a few minutes or an
hour
Often takes a few days
Magnification 500x -1500x 160 000x and photographic
magnification 1000 000x

9. Microscopic Pictures
I am the Outside of the strawberry I am a Chicken embryo

10. KEY WORDS+
• Scientist: is a person engaging in a
systematic activity to acquire knowledge.
• Magnifying: make (something) appear larger
than it is, especially with a lens or microscope
• Lenses: a piece of glass or other transparent
Material with curved sides for concentrating
• Electron microscope: is a type
of Microscope that uses a beam
of electrons to create an image of the
specimen.
• Light microscope: The optical microscope,
often referred to as light microscope, is a
type of microscope which uses visible
light and a system of lenses to magnify
images of small samples.

11. QUIZ
1.Tell me the other name of magnifying glasses?
2. What is a microscope?
3. Who is Robert Hooke?
4. Tell me some key words you have learned
PLUS TASK
5. Do you know something else about
microscopes

12. Thank you
•Thank you for your listening