Transcript Aim: How do biologists study living things? Do Now: Fill in the chart

Date: September 24, 2015 (double periods)
Aim #8: How do scientists make detailed
observations?
Do Now: Warm-Up Notebook
Date
9/24
Title of Activity
Metric Prefixes
Page #
18
HW:
1)
2)
3)
Complete Article Review (Measuring Horses)
Textbook HW #3 (Section 1-4) due Friday 9/25
UNIT 1 TEST- NEXT WEEK THURSDAY/FRIDAY
Date: September 24, 2015
Aim #9: How do scientists make measurements
with a microscope?
Do Now: Warm-Up Notebook
Date
9/24
Title of Activity
Metric Prefixes
Page #
18
HW:
1)
2)
3)
4)
Complete packet pages 22 & 23
Textbook HW #3 (Section 1-4) due Friday 9/25
Pill Bugs please 
UNIT 1 TEST- NEXT WEEK THURSDAY/FRIDAY
1. What is a compound microscope:
 Two
lenses:

Objective lens

Ocular/eyepiece
lens
2. Why is this better than a magnifying
glass?
 Larger
magnification!
 To
calculate total
magnification:

multiply objective power by
ocular power
Let’s try some:

What is the total magnification of
the following microscopes?

10X ocular and 40X objective
= 400X
10X ocular and 10X objective
= 100X



3. What are the parts of the
microscope ?
A.
B.
C.
D.
E.
F.
Eyepiece (ocular)
Body tube
Objective lens
Light source
Adjustment
Arm piece
Not labeled:
diaphragm
Part
Function
A. Eye piece
where you look through to see the image of your specimen (ocular lens)
B. Body tube
the long tube that holds the eyepiece and connects it to the objectives
C. Low power objective
used for low power magnification of the specimen
High power objective
Used for high power magnification of the specimen (not labeled)
D. Light
source of light usually found near the base of the microscope; makes the
specimen easier to see
E. Fine adjustment
small, round knob on the side of the microscope used to fine tune the focus of
your specimen after using the coarse adjustment knob
Coarse adjustment
used for focusing on low power only (not labeled)
F. Arm piece
part of the microscope that is grasped when one carries the microscope
Base
supports the microscope (not labeled)
Diaphragm
controls the amount of light going through to the specimen (not labeled)
Stage
holds slide for viewing specimen (not labeled)
Stage clips
on top of the stage which hold the slide in place (not labeled)
Nosepiece
the rotating part of the microscope at the bottom of the body tube; it holds the
objectives (not labeled)
10. Objects appear upside down and
reverse under the microscope.

What would the letter
“F” look like under the
microscope?
11. Measuring with a Microscope



Estimate the # of times
the object fits across
your field of view
Divide the total
diameter by this
number
Example:
4000/5 = 800 µm