Microscopes and magnifiction
- Created by: jodie.keaveney1
- Created on: 07-11-19 19:35
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- Microscopes and magnification
- Elements
- Light microscope invented about 350 years ago. Uses light to form magnified images of cells and tiny objects
- Best light microscope can produce magnifications of about x2000
- Electron micro invented in last century. Uses electrons to produce magnifications of up to 2 million times
- Higher magnification and resolving power of electron micros allow scientists to see sub-cellular structures
- Resolving Power
- Microscope with a high resolution allows you to distinguish between two objects that are close together
- Light microscope= 200nm Electron microscope (scanning)= 10nm electron microscope (transmission)=0.1nm
- Magnification
- Magnification = size of image/size of real object
- Size of real object = size of image / magnification
- Scale bars
- let you see real sizes of different objects in the diagram
- Lets you calculate the magnification
- If you want to calculate magnification you need to use a ruler to measure the resl length of the scale bar
- Better to make measurement in mm
- Elements
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