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Microscopes and SI Units of Measurement
Fill in the part names. P. XXXVI and the Internet will help.
In the space below, describe the steps necessary to focus a compound microscope on
high power. Number these steps and be complete. Start with “place your slide on the
stage” and take it from there.
1. Fill in the empty boxes
Eyepiece X
10
5
10
5
20
Objective X
Total Magnification X
20
25
200
100
20
15
1500
2. Arrange the following in the order in which light passes through a compound light
microscope.
SPECIMEN
OCULAR LENS
OBJECTIVE LENS
BODY-TUBE
LIGHT
3. What are the maximum magnifications of the following microscopes?
LM
TEM
SEM
4. A group of scientists want to determine whether the bacteria they are studying have
viruses inside them. Which type of microscope should they use? Explain your
answer.
5. List the names and abbreviations for the SI base units for, p. 1114.
Length
Mass
Time
6. Using the prefixes on page 1114, describe which units of measurement would be the
best to use for:
Distance across town:
Height of a person:
Weight of a person:
Weight of an aspirin:
7. If SI measurement is no more accurate than the English system, why do scientists
throughout the world use it?