1. 1.4 Tools & Techniques
Microscopes– tools that extend human vision by making enlarged images of objects
Magnification – power to increase the size of an object
Resolution – power to show details clearly 1

2. 1.4 Tools & Techniques 2 Types of Microscopes
Light microscope– shines a light through a specimen
Has 4 lenses
Objective lenses
4x - scanning
10x – low power
40x – high power
Ocular lens (also called the eyepiece) = 10x 2

3. 1.4 Tools & Techniques
Total magnification = objective lens X ocular lens (10x)
What is my total magnification if I am on high power?
Compound Light microscope
Objects can be LIVING
Lower cost than other microscopes
Commonly used in science classes
Maximum magnification is 2,000x 3

4. 1.4 Tools & Techniques
2. Electron microscope– a beam of electrons produces an enlarged image of the specimen
Scanning Electron Microscope (SEM) – passes a beam of electrons over the specimen to produce a 3-D image (max magnification = 100,000 times) 4

5. 1.4 Tools & Techniques
Transmission Electron Microscope (TEM) – transmits a beam of electrons through a thin slice of the specimen (max magnification = 200,000 times)
Better magnification
$$$
Specimens have to be dead 5

6. 1.4 Tools & Techniques Basic Units of Measurement Base Quantity Name
Abbreviation
Length
meter m
Mass
kilogram kg
Time
second s
Temperature
kelvin k 6