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Use of apparatus and techniques

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Question 2

A light micrograph of a plant cell was taken using a ×40\times 40×40 objective lens. The eyepiece graticule was calibrated using a stage micrometer.

  • The 0 mark on the eyepiece graticule aligns with the 0 mark on the stage micrometer.
  • The 40 mark on the eyepiece graticule aligns with the 5th division mark on the stage micrometer scale.

Each division on the stage micrometer scale represents exactly 0.01 mm0.01\text{ mm}0.01 mm.

The plant cell is measured using the same eyepiece graticule and is found to span from division 10 to division 25 on the eyepiece graticule scale.

Calculate the actual length of the plant cell. Give your answer in μm\mu\text{m}μm to 2 significant figures.

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Use of apparatus and techniques Questions

  1. A Level
  2. /Biology
  3. /Use of apparatus and techniques