Active Learn Quick Quiz 1a.pptx
The most common microscope used today contains two lenses and was invented at the end of the 16th century. Robert Hooke (1635-1703) used a microscope like this to discover cells in 1665.
Hooke's microscope had a magnification of about x30 (this means it made things look approximately 30 times bigger).
This section relates to pages 2-3 in your textbook.
Structure of the light microscope:
Magnification:
The magnification of a microscope is calculated by multiplying the magnification of the eyepiece lens by the magnification of the objective lens being looked through.
For example:
eyepiece lens = x10
objective lens = x4, x10 or x40
Total possible magnification = x40, x100 or x400
Worksheets:
Units of measurement:
| Unit | How many in a metre? | In standard form |
|---|---|---|
| Centimetre | 100 | 1/100 or 1 × 10−2 |
| Millimetre | 1000 | 1/1000 or 1 × 10−3 |
| Micrometre | 1 000 000 | 1/1 000 000 or 1 × 10−6 |
| Nanometre | 1 000 000 000 | 1/1 000 000 000 or 1 × 10−9 |
Comparing the light and electron microscope:
Useful links:
https://www.bbc.co.uk/bitesize/guides/zxm3jty/revision/9
https://biodifferences.com/difference-between-light-microscope-and-electron-microscope.html
https://studyrocket.co.uk/revision/gcse-biology-combined-science-edexcel/cell-biology/microscopy
Summary notes: