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Magnification Formula | Biology for GCSE/IGCSE - Year 11 PDF Download

Magnification Formula

Calculating magnification and specimen size using millimetres as units

  • Magnification is calculated using the following equation:
    Magnification = Image size ÷ Actual size
  • A better way to remember the equation is using an equation triangle:

Magnification Formula | Biology for GCSE/IGCSE - Year 11

  • Rearranging the equation to find things other than the magnification becomes easy when you remember the triangle - whatever you are trying to find, place your finger over it and whatever is left is what you do, so:
    • Magnification = image size / actual size 
    • Actual size = image size / magnification 
    • Image size = magnification x actual size

Remember magnification does not have any units and is just written as ‘x 10’ or ‘x 5000’

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