GCE CIE Biology - Magnification and Measurement Units
Chapter 1 Cell Structure
1.1.b Calculate the linear magnifications of drawings, photomicrographs and electron micrographs
1.1.c Use an eyepiece graticule and stage micrometer scale to measure cells and be familiar with units (millimetre, micrometre, nanometre) used in cell studies
MEASUREMENT UNITS IN CELL STUDIES 📏 🦠:
For GCE CIE Biology, it is important to remember the relevant units of measurement used in cell studies (as equivalent in meters) :
⚠️📝Remember: to convert mm to μm, or μm to nm, just divide by 1000!
EYEPIECE GRATICULE AND STAGE MICROMETER IN MICROSCOPY🔬:
As you can see from the image above, the stage micrometer is being used for calibrating the eyepiece graticule scale.
CALCULATING LINEAR MAGNIFICATIONS 🔎:
The formula to calculate magnification is:
Magnification (M)= Image Size with Ruler (I) ÷ Actual size (A)
⚠️📝Remembering this triangle/formula will come in handy for your GCE CIE Biology exam, especially when doing other calculations (i.e., finding the actual size of the object) .
Yes! All done! Catch you later! 👏
Want to improve your GCE CIE Biology? Check out our study tips here ✒️
Written by Aayushi | GCE CIE Biology Specialist @ TUTTEE
Toole, G., & Toole, S. (2017). Biology in Context for Cambridge International As & A level. Oxford: Oxford University Press.
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