Quiz #4 Microscopes

Question 1

Parts of a compound microscope…

Answer 1

ocular lens, eyepiece, coarse focus knob, fine focus knob, arm, body tube, nose, stage clips, diaphragm, objective lenses, stage, light source, base, aperture, pointer

Question 2

2. What each part of a compound microscope does… (review diagram in notes)

ocular, objective, 
stage/clips, 
diaphragm, aperture, 
coarse, fine, 
eyepiece, nose piece
pointer,

Answer 2

the lens is a curved piece of glass that bends light rays to magnify your slide, the stage is the platform to put the slide on, the stage clips hold the slide in place, the diaphragm controls the amount of shined, the aperture lets the light goto the slide from the light source, the coarse focus knob raises or lowers the stage to focus the slide, the fine focus knob makes objects go into sharp focus, the ocular lens is what you look through to see the slide, the eye piece holds the ocular lens in place, the pointer points at anything in the slide, the objective lens gets held by the nose piece, when switched, magnification changes, the nose piece holds the objective lens

Question 3

5. Theory that was developed as a result of the invention of microscope -

Answer 3

Cell Theory

Question 4

6. Calculating total magnification -

Answer 4

multiply magnifications of ocular & objective lenses

Question 5

7. How object’s appearance is different when viewed through the microscope

Answer 5

magnified (enlarged/bigger)
inverted (upside down)
reversed (backwards)

Question 6

8. Types of microscope

Answer 6

a. Simple - one lens, refracts light, limited to “low” magnifying power
b. Compound - multiple lenses, refract light, more powerful magnification
c. Electron - uses negatively charged electrons to magnify up to 300,000x

Question 7

a. Refracting -

Answer 7

bending of light rays

Question 8

b. Aperture -

Answer 8

opening in stage of microscope that allows light to the lenses

Question 9

c. Inverted -

Answer 9

upside down

Question 10

d. Reversed -

Answer 10

backwards

Question 11

e. Magnified -

Answer 11

bigger/enlarged (allows for more detail to be seen)

Question 12

f. Pointer -

Answer 12

attached to & moves with eyepiece and points to center of view-field

Question 13

g. Viewfield -

Answer 13

visible area when looking through the ocular lens

Question 14

h. Measuring Grid -

Answer 14

used to measure things viewed through a microscope

Question 15

b. total magnification decreases…

Answer 15

the visible area of viewfield increases

Question 16

Benefit of microscope having more lenses -

Answer 16

more lenses = more magnifying power = more visible detail → better observations
…and better observations → new discoveries & better understanding

Question 17

total magnification increases..

Answer 17

. the visible area of viewfield decreases

Question 18

b. total magnification decreases…

Answer 18

the visible area of viewfield increases