Topic 1) Microscopes

Question 1

what are the 3 objective lenses on a microscopes?

Answer 1

x2
x5
x10

Question 2

light microscope

Answer 2

uses a beam of light to produce an image
magnifies to x2000
cheap and easy to use
creates only 2D images

Question 3

electron microscopes

Answer 3

uses a beam of electrons to produce an image
magnifies to x2000000
high resolution
extremely expensive and more difficult to keep
creates both 2D and 3D images

Question 4

how to use a microscope?

Answer 4

1) take thin sample of cells (one cell thick)
2) place specimin on the stage
3) add 2 drops of stain (e.g iodine)
4) place the cover slip over specimen (avoid air bubbles)
5) view under microscope

Question 5

magnification =

Answer 5

size of image / actual size of object