Observing cells with a light microscope

Cells are inert 'building blocks' like bricks. Microscopes can see structures as small as molecules.

The lesson explores what cells are, including that they are living units, and considers what can and can't be seen using a light microscope.

Keywords

• Cell - A cell is the smallest living building block of a living organism.
• Lens - A lens is a piece of curved glass which focuses light to alter the size of the image.
• Light microscope - A light microscope is a piece of equipment that uses lenses to focus light and enlarge the object.
• Focus - Adjusting the focus of a lens makes an image clearer.
• Magnification - Increasing the magnification of an object makes it look bigger.

In the final learning cycle, pupils should be given hands-on experience of setting up and focussing a light microscope for themselves, and using it to observe cells. The method can be provided as a worksheet by printing the Additional Material.