Microscopes (and the Discovery of Cells)

Question 1

What did ´´Robert Hooke´´ discover?

Answer 1

-he used a rudimentary microscope (30x) to observe cork from trees (what he saw reminded him of the ¨cells¨ in a monastery) (1665)

Question 2

What did Anton Van Leevwenhoek discover?

Answer 2

-he saw the first single celled micro-organisms using his 500x microscope (1674)

Question 3

compound microscope:

Answer 3

the optical microscope (light) that is made from 2 lenses

Question 4

ocular lens (eyepiece):

Answer 4

the lens you look through

Question 5

objective lens:

Answer 5

the lens closer to the specimen you are viewing

Question 6

What was the objective lens used to first find the specimen?

Answer 6

-the ´´low magnification lens´´

Question 7

Which knob is used to focus under high power?

Answer 7

-the ´´fine coarse´´ knob

Question 8

revolving nose piece:

Answer 8

allows you to change lenses

Question 9

diaphragm:

Answer 9

controls the amount of light

Question 10

magnified image:

Answer 10

is a image which is enlarged by a mirror

Question 11

magnification:

Answer 11

refers to an action of magnifying something

Question 12

field of view:

Answer 12

the actual (unmagnified) diameter of what you see when you look through the eyepiece

Question 13

image size:

Answer 13

how big the magnified image is

Question 14

electron microscope:

Answer 14

an extremely powerful microscope that uses a beam of electrons instead of a beam of light

Question 15

scanning electron microscope (SEM):

Answer 15

an electron microscope in which a beam of electrons sweeps over a specimen, creating a three-dimensional image (designed by German scientists in 1930ś)

Question 16

transmission electron microscope (TEM):

Answer 16

an electron microscope in which a beam of electrons produces a two-dimensional image (designed by German scientists in 1931)