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This lesson covers microscopy, magnification and resolution as required by the AQA GCSE Combined Science Trilogy specification (8464). You need to understand how light and electron microscopes work, carry out magnification calculations and express answers in standard form.
Most cells are too small to be seen with the naked eye. The invention of microscopes has allowed scientists to observe cells and subcellular structures in detail. The development of microscopy has directly led to our understanding of cell biology.
Light microscopes use visible light and glass lenses to magnify specimens.
| Property | Detail |
|---|---|
| Maximum magnification | Approximately ×1500 |
| Maximum resolution | Approximately 200 nm (0.2 μm) |
| Type of specimen | Living or dead; can be stained |
| Size | Relatively small and portable |
| Cost | Relatively inexpensive |
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