Unit II The Microscope

1
Unit II The Microscope

• Pages 27 - 33

2
Terms

• Magnifying glass magnifies objects (makes them
  appear bigger) /
• considered to be the first microscope
• Microscope a very important tool for scientists
  / makes it possible for you to see things that
  you can not see with the naked eye (first one
  magnifying glass simple microscope

3

• Vesalius he used direct observation / used the
  lenses in his eyes
• Lens brings together or focuses rays of light
• Image what you are looking at / the picture you
  see

4
Types of Microscopes and Scientists Involved

• Simple Microscope has one lens
• Anton Van Leeuwenhoek page 29 and 30-31
• 1683
• scientist responsible for making a microscope
• with ONE strong lens SIMPLE
• MICROSCOPE
• magnified 266 X
• studied organisms in pond water called
• animalcules

5

• Compound Microscope page 32
• much more powerful than a simple
• microscope / common in schools
• light microscope that has more than one
• lens has two convex lenses
• light source is very important
• 2 lenses (bends the light that passes
• through an object)
• 1. ocular lens (eyepiece) magnifies
  
• objects 10x (so 10 times bigger)
• 2. objective lens 3 types
• high
  40x,43x,65x
• low 10x
• scan 4x

6
Scientists involved with the Compound Microscope

• Hans Janssen
• 1590
• first man to invent the compound microscope
• Robert Hooke page 28
• 1660
• Improved the microscope providing LIGHT under the
  specimen / looked at cork cells
• Key to the microscope is the light!
• Light passes through the object being examined to
  the eye and forms an image

7
Other Microscopes of Todaypages 31-33

• Electron Microscope uses electron beams, not
  light
• Transmission Electron
• Scanning Electron
• Scanning Tunneling Electron
• Phase Contrast Microscope new microscope (can
  compare two hairs)

8
Magnification????

• Ability to make things bigger
• Magnify 4x / 10x / 40x / 43x / 65x
• If 10x of ocular lens and on low power (10x)
  What is the total magnification?
• Answer 100x (10 x 10)
• What is the total magnification of a microscope
  on high power with 43x?
• Answer 430x