Cell measurement: Completed

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  • Created by: Janelle M
  • Created on: 08-06-18 19:55
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  • Cell measurement
    • Light microscopes
      • Cells range in size:
        • plant cells are between 0.01 mm – 0.10 mm
        • animal cells are between 0.01 mm – 0.05 mm
      • The human eye can see objects as small as around 0.05 mm.
      • A microscope is required to see cells in any detail.
      • Microscopes magnify the image of a biological specimen so that it appears larger.
      • The type of microscope used in a school laboratory is a compound microscope.
    • Calculating the magnification of the microscope
      • The compound microscope uses two lenses to magnify the specimen – the eyepiece and an objective lens.
      • In most microscopes, there is a choice of objective lenses to use.
      • Magnification can be varied according to the size of the specimen and the level of detail required.
      • The magnification of a lens is shown by a multiplication sign followed by the amount the lens magnifies, eg ×10.
      • Magnification of the microscope = magnification of eyepiece × magnification of objective
      • So, if the magnification of an eyepiece is ×10 and the objective is ×4, the magnification of the microscope is:
        • magnification of eyepiece × magnification of the objective= 10 × 4= 40
    • Calculating the magnification of an image
      • Microscopes use lenses to magnify the image of a biological specimen so that it appears larger.

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