BIOLOGY- biology and microscopy

Question 1

early microscopes (Hans and Zacharias Jansen)

Answer 1

-invented microscope in 1500’s
- ocular lens (eyepiece) and objective lens
- magnifying power of 20x

Question 2

Robert Hooke

Answer 2

• 3 lens microscope
• uses beam of light

Question 3

micrographia

Answer 3

illustrations of various living and non-living things as they appear under a microscope

Question 4

what was robert hooke interested in?

Answer 4

the structure of cork, which was lightweight, could float, firm and compressible

Question 5

who named cells

Answer 5

robert hooke

Question 6

Anton Van Leeuwenhook

Answer 6

-single lens microscope
- could magnify 250x

Question 7

who was the first to see movement of single celled organisms (animalcules)

Answer 7

anton van leeuwenhoek

Question 8

parts of the microscope (draw it if you need)

Answer 8

1. ocular lens
2. body tube
3. revolving nosepiece
4. arm
5. objectives
6. stage
7. stage clips
8. diaphragm
9. course adjustment knob
10. fine adjustment knob (the smaller one)
11. light source
12. base

Question 9

calculating total magnification

Answer 9

multiply magnifications of individual lenses (eg. 10x multiply 4x = 40x magnification)

Question 10

object size formula

Answer 10

object size = filed of view diameter/ number of objects to fit across field of view

Question 11

scale

Answer 11

drawing size/ object size

Question 12

is scale recorded in ratios?

Answer 12

yes

Question 13

why do we need to calculate the high power field of view?

Answer 13

because it can be too small to see

Question 14

calculating high power FOV

Answer 14

low power FOV x low power magnification/ high power magnification

Question 15

micrometers

Answer 15

1/1000th of a millimeter