more of light microscopes

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  • Created by: tia5sos
  • Created on: 25-11-20 20:26
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  • more on light microscopy
    • magnification is how many times bigger the image is than its real size
      • if you know the power of the lenses used by a microscope to view an image, you can work out the total magnification of the image using this simple formula
        • total magnification = eyepiece lens magnification x objective lens magnification
        • example: what is the total magnification of an image viewed with an eyepiece lens magnification of x10 and an objective lens magnification of x40?
          • 10 x 40 = 400, so the total magnification is x400
      • if you don't know which lenses were used, you can still work out the magnification of an image as long as you can measure the image and know the real size of the specimen. This is the formula you need: magnification = image size over (divided by) real size
        • both measurements need the same units to do this, if they are not the same you need to convert them
        • if you want to work out the image size or the real size of the object you can rearrange the equation using the formula triangle.
          • cover up the thing you are trying to find. The parts you still see are the formula you need to use.
    • you need to know how to work with standard form
      • 1. because microscopes can see such tiny objects sometimes it's useful to write numbers in standard form
      • 2. this is where you change very big numbers or small numbers with lots of 0's into something more manageable e.g. 0.017 can be written as 1.7 x 10
      • 3. to do this you just need to move the decimal point left or right
      • 4. the number of places the decimal point moves is then represented by a power of 10 - this is positive if the decimal point's moved to the left, and negative if it's moved to the right

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