Microscopy and Calculations
Getting comfortable with microscopes is easier than you think - just remember to always start on the lowest magnification before working your way up. Use the coarse focus knob first, then switch to fine focus for crystal-clear images of cells.
The magnification formula is your best friend: magnification = image size ÷ real size. Don't forget that magnification also equals eyepiece × objective lens. When dealing with measurements, always convert units carefully - micrometers (µm) are commonly used for cell measurements.
For any experiment, you'll need to calculate percentage change using: % change = (change ÷ original) × 100. Uncertainty is simply the range divided by 2, which helps you understand how reliable your measurements are.
Quick Tip: When converting from millimetres to micrometers, multiply by 1000 - this catches out loads of students in exams!
