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A-Level Biology OCR A

Graticule Stage Micrometer Divisions Work Real Eyepiece Explain

Front Explain how to use a stage micrometer to work out the real distance represented by small divisions in an eyepiece graticule under 3 different objective lenses.
Back Using a stage micrometer and eyepiece graticule
  • Work out how many micrometer divisions (10micrometers each) the graticule takes up
  • Divide this length by number of divisions of graticule in order to calibrate it
  • Then use the graticule to measure real microscopic lengths
  • When changing lens plug into magnification equation to re-calibrate the graticule without using the stage micrometer 

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