Transcript Parts of a Compound Light Microscope

Parts of a Compound Light
Microscope
Mirror / Light
• the light source for a microscope, typically
located in the base of the microscope.
• Most light microscopes use low voltage,
halogen bulbs with continuous variable
lighting control located within the base.
A. Mirror / Light
Coarse adjustment knob
• used to focus the microscope
• You use it to move the objective lenses
toward or away from the specimen.
C. Course
adjustment
knob
Fine adjustment knob
• used to focus the microscope
• This is the knob used to fine tune the
focus on the specimen.
• It is also used to focus on various parts of
the specimen.
• Generally one uses the coarse focus first
to get close then moves to the fine focus
knob for fine tuning.
B. Fine
adjustment
knob
Eye piece
• The eyepiece or Ocular is what you look
through at the top of the microscope.
• Most eyepieces have a magnifying power
of 10x.
D. Eye piece
Nose piece
• The part of the microscope that holds the
objective lenses also called a revolving
nosepiece or turret.
• The objectives are exposed and are
mounted so that different objectives can
be selected.
• Standard objectives include 4x, 10x, 40x
and 100x.
F. Nose
Objective lenses
• The primary optical lenses on a
microscope.
• They range from 4x-100x and typically,
include, three, four or five on lens on most
microscopes.
G. Objective lenses
Stage clips
• Holds the slide in place
• The viewer is required to move the slide
manually to view different sections of the
specimen.
H. Stage Clips
Stage
• where the specimen to be viewed is
placed.
I. Stage
Diaphragm
• controls the amount of light reaching the
specimen.
J. Diaphragm
Hooke's compound microscope
• From "The
Microscope and Its
Revelations"
Carpenter, 1891:
image of Hooke's
compound
microscope 1665
Leeuwenhoek's simple microscope
• From "The
Microscope and Its
Revelations"
Carpenter, 1891:
images of
Leeuwenhoek's
simple microscope
Today we will be looking at:
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Salt crystals
Wool fibers
Cotton fibers
The letter “e”
Dust
Volcanic ash
colored thread
newspaper print
nylon fibers
cork
silk fibers
corn starch
• You will select 5 to practice focusing &
drawing (in color) under all three powers
D. Eye piece
C. Course
adjustment
knob
B. Fine
adjustment
knob
E. Nose
G. Objective lenses
H. Stage Clips
I. Stage
A. Mirror / Light
J. Diaphragm