1. Cells and Microscopy

2. The Big Questions How do we even know cells are even there?
What has advanced our understanding of cells?

3. Specification Link
Describe how plant and animal cells can be studied in greater detail with a light microscope
Demonstrate an understanding of how changes in microscope technology have enabled us to see cells with more clarity and detail than in the past, including simple magnification calculations

4. Light Microscopes
Microscopes let us see things that we can’t see with the naked eye.
Light microscopes were invented in the 1950’s. They let us see things like nuclei, chloroplasts and mitochondria.

5. PARTS OF A MICROSCOPE Eyepiece Lens Handle Objective Lens Stage
Focusing Knob
Mirror
Test

6. Microscopes Light Microscopes Electron Microscopes Invented in 1590’s.
They let use see things like nuclei, chloroplasts and mitochondria.
Invented in the 1930’s.
Let use see much smaller things in more detail like the internal structure of mitochondria and chloroplasts.

7. Lung

8. Kidney

13. Magnification Rearranging this tells us that
The length of
the magnified object = Length of the object X Magnification
Rearranging this tells us that
Length of object = Length of the magnified object
The magnification

14. You need to learn those equations!!

15. 1. A scientist looks at a cell with a microscope that has a magnification of times 40.
The cell is 0.1 mm long.
Calculate the size of the magnified image.
(2)
2. The electron microscope can magnify images than the light microscope.
(ii)  The diagram shows a sperm cell that has been magnified times.
Calculate the actual length of the sperm cell.