Lab 3 Part 1

Topics: Optics, Lens, Telescope Pages: 9 (830 words) Published: May 31, 2014
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 ocular lens and a 10X objective lens?

10X

20X

100X

1000X
Question
11  of 25
Which of the following describes proper microscope care and technique.

Be sure to carry the microscope upright, with one hand on the arm and the other under the base.

To protect the optics of the microscope, place it down gently and don't drag it across the tabletop.

Always begin focusing with the lowest power lens available.

Only use the coarse focus knob with the scanning and low power lenses.

All the above are examples of correct microscope care and technique. Question
12  of 25
Turning which of the following knobs moves the objective lenses the greatest vertical distance?

coarse focus knob

fine focus knob

Question
13  of 25
Resolution is the ability to see two objects as separate.

True

False
Question
14  of 25
Which of the following regulates the amount of light passing through the slide specimen on the microscope stage?

nosepiece

objective lens

iris diaphragm lever

fine focus knob
Question
15  of 25
An increase in magnification causes

a decrease in the field of view.

a decrease in the working distance.

a decrease in the depth of field.

all of the above.
Question
16  of 25
Working distance is the

distance from your house to your job.

distance the microscope nosepiece travels using the coarse focus knob.

distance from the bottom of the objective lens to the specimen.

distance the specimen can travel across the microscope stage. Question
17  of 25
When adjusting a binocular microscope for differences between right and left eyes, focus the microscope with the fine adjustment while viewing only with the right eye (fixed ocular).

True

False

Question
18  of 25
When using the oil immersion lens, you should rotate the objective lenses to the side for easy application of an oil droplet to the slide.

True

False
Question
19  of 25
Why must a small object seen through the ocular lens...
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