microscopes

• microscope

  A) light

  B) stage

  C) high and low objective lenses

  D) eyepiece

  E) clip

  F) coarse adjustment knob

  G) fine adjustment knob

  
• what is the magnification of a microscope

  1500-2000
• what is the resolution of a microscope

  0.2um
• magnification


  how much bigger the image is than the specimen
• magnification = image size / object size
• resolution 


  how well a microscope distinguishes between two points that are close together
• light microscopes

  • They use light
  • They have a lower resolution than electron microscopes.
  • They have a maximum resolution of about 0.2 um
  • usually used to look at whole cells or tissues.
  • The maximum useful magnification of a light microscope is about × 1500.
• electron microscope 


  uses electrons instead of light to form an image
• Electron microscopes use electrons instead of light to form an image. They have a higher resolution than light microscopes so give more detailed images.
• comparing microscopes

  A) 0.2um

  B) x1500

  C) 0.0002 um

  D) more than x1,000,000

  E) 0.002um

  F) less than x500,000

  
• magnification = image size/actual size