Cells and Microscopy

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

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

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.

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

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.

Lung

Kidney

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

You need to learn those equations!!

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 100 000 times.   Calculate the actual length of the sperm cell.