The light microscope was invented in the seventeenth century by Antonie van Leeuwenhoek (1632–1723). It allowed scientists to ‘see into’ cells for the first time.
:Fig. 3.6 An animal cell under a light microscope
:Fig. 3.8 Antonie van Leeuwenhoek :Fig. 3.7 A plant cell under a light microscope FIGURE IT OUT!
Calculate the overall magnification of a cell in a specimen when the eyepiece lens is set at × 10 and the objective lens is set at × 40.
? TEST TUBE
5. Which objective lens should you begin with: low, medium or high? 6. Which of the following statements is correct? a. I adjusted the coarse focus first and then the fine focus. b. I adjusted the fine focus first and then the coarse focus.
EXPERIMENTAL INVESTIGATION 3.1 How can we look at animal cells?
Equipment
Sterile cotton swabs or tongue depressors
Water Dropper Glass slide
Cover slip Seeker or mounted needle Microscope Methylene blue stain Tissue paper
SAFETY • Be careful when handling glass slides and cover slips.