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14 Cards in this Set

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How many lenses in a microscope?
2 lenses
How many times can a light microscope magnify an image?
1000x
How much more powerful is an electon microscope?
1 nanometer
my nickname...
How does a light microscope magnify an image?
-bends the light rays from an object
-focusing them to form an image of the object.
2 steps...
Magnification
The degree to which the image of a specimen is enlarged
larger...
Resolving Power
How well specimen detail is preserved during the magnifying process
detail...
Contrast
Ability to see specimen detail against its background (stains/dyes added to increase contrast)
background...
Ocular lens
the upper lens/eyepiece viewer looks for. It focuses the light on the retina of the eye.
Objective lens
The lenses in a microscope closest to the specimen. 3 or 4--40x,100x,400x.
Diaphragm
Regulates the amnount of light that goes through the specimen.
Fine Adjustment knob
small adjustments when focusing.
course adjustment knob
large adjustments when focosing (at scanning level)
parfocal
The ability of the microscope to remain in focus when switching from 1 objective lens to the next highest power.
What are the diameters?
40x= 4200 micrometers
100x= 1680
400x= 420