February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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1Microscopy MagnificationMedium1 mark
The eyepiece graticule for a light microscope at magnification was calibrated using a stage micrometer scale, as shown in the diagram.
Each small division on the stage micrometer scale measured exactly 0.01 mm.
Diagram of a stage micrometer scale (top) aligned beneath an eyepiece graticule (bottom); the stage micrometer scale is marked in divisions of exactly 0.01 mm, and the eyepiece graticule below it is numbered 0 to 100 in smaller divisions used to measure the organism
A single-celled organism was viewed with the light microscope at magnification. The length of the organism measured 47 units on the eyepiece graticule.
What is the actual length of the organism?