Lab 3 Part 1

Your assignment is worth 50 points.
Question
1 of 25
What property of a compound light microscope enables a person to change objectives without major focusing adjustments?

resolving power

magnification

parfocal

focusing

resolution
Question
2 of 25
How does closing the iris diaphragm affect image brightness and contrast?

decreases both

increases both

decreases brightness and increases contrast

increases brightness and decreases contrast

decreases brightness but has no effect on contrast
Question
3 of 25
Which of the following objectives has the shortest working distance?

4X

10X

45X

100X
Question
4 of 25
What effect will changing from the low power objective to the high power objective have on the field of view of a specimen?

increase

decrease

no effect

Question
5 of 25
If the letter p is placed under the microscope in the normal reading position, which of the following orientations of the letter would the viewer see?

b

p

q

d
Question
6 of 25
Which of the following procedures should be done just prior to adjusting the diopter, when using the compound microscope?

Clean all lenses with lens paper

Turn the light on

Adjust the iris diaphragm

Adjust the fine focus
Question
7 of 25
Two parts of the microscope that regulate the amount of light visible through the ocular are the:

fine and coarse adjustment knobs

ocular and objective lenses

illuminator and revolving nosepiece

condenser and iris diaphragm

Question
8 of 25
Initial focusing of any slide is done under the:

scanning or low power objective

high power objective

oil immersion objective

depends upon the size of the specimen

Question
9 of 25
Under which magnification would the distance between the objective and the specimen being observed be the least?

40X

100X

450X

1000X

Question
10 of 25
What is the total magnification produced by a microscope, using a 10X