A-LevelBiologyCell structure9700/12 · Feb/Mar 2024 · Q11 Mark
A student used a light microscope to observe a blood smear on a microscope slide. An eyepiece graticule was used to measure the diameter of a white blood cell on the slide. The student recorded that the white blood cell was 5 eyepiece graticule units in diameter. Which additional information does the student need to determine the diameter of the white blood cell in micrometres?
Acalibration of the eyepiece graticule using a stage micrometer only
Bcalibration of the eyepiece graticule using a stage micrometer and the magnification of the eyepiece lens
Cthe magnification of the eyepiece lens only
Dthe magnification of the eyepiece lens and the magnification of the objective lens
✓ Correct answer
A: calibration of the eyepiece graticule using a stage micrometer only
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