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• Four major parts of a compound light microscope are the ocular lens, objective lens, stage, and light source.

• Transmission and scanning electron microscopes provide greater magnification than light microscopes.

• Scientists use the metric system to take scientific measurements.

• Lab safety is a good laboratory practice.

Vocabulary compound light microscope (p. 21) eyepiece (ocular lens) (p. 21)

objective lens (p. 21) stage (p. 21) light source (p. 21) magnification (p. 22)

nosepiece (p. 22) resolution (p. 22) scanning electron microscope (SEM) (p. 22)

transmission electron microscope (TEM) (p. 22) metric system (p. 23) base unit (p .23)

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