Microscope Techniques and Osmosis Experiments

Using a microscope might seem tricky at first, but it's actually straightforward once you know the steps. Start by placing your slide on the stage and securing it with clips, then select the lowest power objective lens. The key trick is positioning the lens so it almost touches the slide before looking through the eyepiece - this prevents you from accidentally crashing the lens into your specimen.

When you're ready to focus, use the coarse focusing dial first to bring your cells into view, then switch to the fine focusing dial for that crisp, clear image. Always start with low power and work your way up to higher magnifications.

The osmosis practical with potato cylinders shows how water moves through cell membranes. You'll need to peel your potato (the skin blocks osmosis), cut identical cylinders, and measure their length and mass before placing them in different sugar solutions overnight. The cylinder in distilled water should gain mass, while those in sugar solutions will lose mass.

Top Tip: When drying your potato cylinders, gently roll them on paper towels - don't press hard or you'll damage the cells and mess up your results.