Topic: Microscope
Aim: Describe the structure of the compound
microscope.
Do Now:
1. Take out Cell Transport Review #2 ISA
2. Take out your microscope notes.
HW: Castle Learning – Cell Respiration and
Transport  Due Friday
A normal picture of a bluebottle fly maggot. But a
magnified view looks very different…
For every one human being on Earth, there are
almost 2 million ants.
The clawed tip of an adult fig-eater beetle's leg
Pollen from a variety of plants (sunflower, morning glory, holleyhock, lily,
primrose and caster bean).
A side view of a moth’s head.
A breast cancer cell that shows the overall shape
of the cell's surface at a very high magnification.
Blood
Cheek Cells 40x
Onion Cells 10x
Eyepiece
• Ocular (usually 10x)
• Lens you look through
Body Tube
• Connects eyepiece to nosepiece
Objective lenses
• Contains lenses
• Low, medium, high power
Scanning
objective
Low power
objective
High power
objective
1. Which objective provides the larger field of view? Low or high power?
Support your answer.
Low power because it has a LARGER field of view.
2. Which objective is used when searching for the specimen on a slide?
Low power because it has a LARGER field of view.
3. Which objective makes the image appear larger?
High power
A
Low Power
B
High Power
•LARGER Field of view
•Smaller Field of View
•Used when trying to
locate specimen on the
slide
•More magnification
In the space at the bottom of the sheet:
• Low power objective:
Gives a larger field of view
• High power objective:
Magnifies image to provide a larger image
Nosepiece
• Holds & rotates obj. lenses
Nosepiece
Arm
• Supports microscope when
carried
• Support
Base
How must you ALWAYS carry a
microscope???
One hand
holds the
arm. The
other hand is
under the
base.
Stage
• Where slide is placed
Stage Clips
• Hold slide in place
Light Source
• Illuminates specimen, provides
light
Diaphragm
• Controls the AMOUNT of light
used
High Power
•Darker
Low Power
•Brighter
Darker under high power
Coarse Adjustment Knob
• Larger focusing knob
•Moves stage up and
down for focusing
•For LOW POWER
ONLY
Fine Adjustment Knob
• Moves the stage slightly to sharpen
the image
• Focus under high power
Let’s summarize…Identify the microscope part
described.
Fine adjustment
1. Used to focus the specimen under high power.
2. Adjusts the amount of light reaching the specimen.
Diaphragm
3. Platform slide is placed on. Stage
4. Objective used to view a larger field of view needed
to search for a specimen. Low power objective
5. Used to focus specimen under low power Coarse
adjustment
6. Structure that you look through. Ocular
7. Contains lenses. Ocular and objectives
8. Keeps slide in place. Stage clips
9. Objective used to view a larger and more magnified
view of the specimen. High power objective
10. Objective used to search for a specimen.Scanning obj.
http://www.biologycorner.com/microquiz/#