Cell measurement: Completed
- 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.
- Cells range in size:
- 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.
- Light microscopes
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