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Microscopes - 7th Grade
Transcript of Microscopes - 7th Grade
Page 13 in ISN
(page 68-70 in textbook)
AVID EQ: How do microscopes work and what are their limitations?
is an optical tool that makes smaller images appear larger.
– first primitive microscope.
– Robert Hooke used a simple microscope to observe pores in cork.
He called them “cells”
Antonie van Leeuwenhoek
discovered microscopic life in a drop of pond water using a primitive microscope.
Magnification vs Resolution
increase of an object’s apparent size .
power to show details clearly.
are needed to see a clear image.
1. When was the first microscope made?
2. What did Antonie van Leeuwenhoek discover?
3. Describe Magnification & Resolution. Why do you need both?
First made in 1931
Used to observe VERY small objects: viruses, DNA, parts of cells.
Uses beams of electrons rather than light.
Much more powerful than light microscopes.
must be dead.
Scanning Electron Microscope
Can magnify up to 100,000.
Transmission Electron Microscope
Can magnify up to 250,000 times.
2D image only.
4. How do electron microscopes work?
5. Can the specimen be alive for electron microscopes to use?
6. Which electron microscope has greater magnification? Which can produce a 3D image?
Original microscope, most widely used.
Uses light, light passes through 2 or more lenses.
Can magnify up to 2000 times, limited by light.
Total magnification = ocular lens x objective lens.
1. Eyepiece + Ocular lens
2. Arm -
only hold a microscope by it's arm!
3. Coarse Focus -
6. Power Switch
(find it on yours)
7. Illuminator -
4. Fine Focus -
8. Diaphragm -
adjust the amount of light that gets through.
9. Stage -
slide goes here
10. Stage clips -
securely holds slide
12. Rotating head
11. Objective lenses -
4x, 10x, 100x
Part 1: On page 12, compare and contrast light and electron microscopes.
Part 2: Compare and contrast TEM and SEMs.