microscopy 1.1.5

Cards (19)

  • we need microscopes because cells are too small to see with the naked eye
  • x 4 objective lens = 40 magnification
  • image size = actual size x magnification
  • resolution is the ability to distinguish between 2 separate points
  • 1 millimetre is 0.001 metre
  • 1 metre is 1000 milimetres
  • 1 millimetre is 1000 micrometers
  • 1 micrometer is 0.001 millimetres
  • 1 nanometre is 0.001 micrometres
  • 1 micrometre is 1000 nanometres
  • 1000 millimetres is 1 metre
  • if a microscope has a higher resolving power, the image would look clearer and would show more detail it would be crisper and less blurred
  • light microscopes use light and lenses to form an image of a specimen and magnify it, they let us see individual cells and large subcellular structures, like nuclei
  • electron microscopes use electrons instead of light to form an image. they have a much higher magnification than light microscopes, they also have a higher resolution
  • the microscopy techniques we can use have developed over the years, as technology and knowledge have improved
  • electron microscopes let us see much smaller things in more detail, like the internal structure of mitochondria and chloroplasts, they even let us see smaller things like ribosomes and plasmids
  • Magnification is the ability to make small objects seem larger, such as making a microscopic organism visible. Resolution is the ability to distinguish two objects from each other
  • light microscopes however, are much cheaper
  • electron microscopes cannot be used to view living things