Page 20 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

of organisms can be studied well if
magnified by the microscope. There
are two types of microscopes: Electron
Figure 2.10: Mounting needle microscope and Light microscope.
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Microscope slide and coverslip The electron microscope
The microscope slide is a small flat piece The electron microscope uses beams
of glass that is used to hold specimen of electrons to magnify specimens.
under observation. A specimen to be The maximum useful magnification
observed under a microscope is placed of most electron microscopes is about
on a slide with a drop of a liquid and a million times (1 000 000×). These
covered with a coverslip. An example microscopes are very expensive. They
of a microscope slide and coverslip is are mostly found in research centres or
shown in Figure 2.11. research institutions.
Cover slip
The light microscope
The light microscope is the type of
microscope that depends on light to
illuminate and magnify tiny specimens.
Microscope slide
For this matter, it differs from the
Figure 2.11: Microscope slide and electron microscope by having lower
coverslip magnification. The maximum useful

magnification of most light microscopes
Microscope is about one thousand times (1 000×).
A microscope is an instrument that This type of microscope is commonly
is used during scientific studies to
magnify very small specimens so that used in schools and health facilities.
their details can be seen. The smallest An example of the light microscope is
structures of cells, tissues, and organs shown in Figure 2.12.

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