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biology paper 1
Unit 1 - Cell biology
microscopes / magnification
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the
light microscope
was invented about 350 years ago it uses light to form magnified images of
cells
and other tiny objects
the
highest
number the light microscope can produce is
x2000
the
electron microscope
was invented in the
last
century
the electron microscope uses electrons to produce
magnifications
of up to
2
million
the
higher magnification
of
electron microscopes
allow scientists to see and understand sub-cellular structures
to calculate magnification you use
magnification
=
size
of
image
/
size
of
real image
to calculate size of real object you use size of real object =
size of image
/
magnification
You can use a
light microscope
to observe draw and label a selection of
plant
and animal cells.
eyepiece
/
revolving nose piece
objective lens
stage
condenser
illuminator
base
ocular lens
arm
coarse focus
fine focus