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Cards (9)
Light
microscopes
Microscopes that use
visible light
to illuminate and
magnify
specimens
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Cell size range
Animal
cells: 0.01 mm - 0.05 mm
Plant
cells: 0.01 mm - 0.10 mm
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The human eye can see objects as small as around
0.05
mm. A microscope is required to see
cells
in any detail.
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Microscopes
Magnify
the image of a biological specimen so that it appears
larger
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Compound microscope
The type of microscope used in a
school laboratory
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Compound microscope
Uses
two
lenses to magnify the specimen - the
eyepiece
and an objective lens
There is a choice of
objective
lenses to use
Magnification
can be varied according to the
size
of the specimen and the level of detail required
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Magnification
Shown by a
multiplication
sign followed by the amount the lens
magnifies
, e.g. ×10
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Calculating the magnification of the microscope
Magnification of the microscope = magnification of
eyepiece
× magnification of
objective
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Calculating the
magnification
of an image
Magnification =
size
of
image
/ size of object
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