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Module 3 Review Essential Microbiology
M3: Module 3 Review
Due No due date
Points 5
Questions 16
Time Limit None
Attempt History
Attempt Time Score
LATEST Attempt 1 363 minutes 0 out of 5 *
* Some questions not yet graded
Score for this quiz: 0 out of 5 *
* Some questions not yet graded
Submitted Sep 9 at 3:32pm
This attempt took 363 minutes.
Question 1
Not yet graded / 0 pts
Define the measurements micrometer and nanometer.
Your Answer:
A micrometer is one-millionth of a meter and a nanometer is one-billionth of a meter.
A micrometer (µm) is defined as being one-millionth of a meter and is commonly designated at 10-6
meters. A nanometer (nm) equals 10-9 m or one-billionth of a meter.
Question 2
Not yet graded / 0 pts
What are the two critical factors that influence your ability to see an object?
Your Answer:
Resolution and contrast are the two critical factors that can influence your ability to see an object.
Resolution is how far apart 2 objects are and contrast is the difference in light absorbance between 2
objects.
Resolution and contrast. Resolution refers to the distance between two objects at which the objects
This study source was downloaded by 1827175 from cliffsnotes.com on 01-08-2026 18:40:38 GMT -06:00
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https://www.cliffsnotes.com//study-notes/19530141 Module 3 Review Essential Microbiology with Lab Milligan 02A..pdf10/20/2026, 4:09:33 AM
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Module 3 Review Essential Microbiology
still can be seen as separate. Poor or low resolution means two (or more) objects may appear as one.
The contrast is the difference in light absorbance between two objects. Poor contrast gives a high
background and makes the visualization of multiple objects difficult. For instance, trying to identify 2
dark colored objects at night (low light = low contrast) versus the same 2 objects in the middle of a
sunny afternoon (bright light against 2 dark objects = high contrast).
Question 3
Not yet graded / 0 pts
If you wish to increase the amount of light going into a microscope, what part would you adjust?
Your Answer:
You would have to adjust the iris diaphragm.
The iris diaphragm controls the amount of light that passes through the sample and into the objective
lens. Thus, as you open the iris more light is permitted to pass through to illuminate the sample.
Question 4
Not yet graded / 0 pts
As light passes through a microscope, what is the last piece that light passes before reaching your
eyes?
Your Answer:
The last piece that light would pass through before reaching your eyes is the ocular lens.
Once light passes through the sample and the objective lens it is directed through the ocular lens, or
eyepiece, directly into your eye.
Question 5
Not yet graded / 0 pts
How is the total magnification of an object calculated?
Your Answer:
The total magnification is calculated by multiplying the power of the ocular eyepiece with the power of
the objective lens that your are working with.
Total magnification is calculated by multiplying the power of the objective and the power of the
eyepiece. For instance, a 40x objective with a 10x eyepiece would make an object appear (40 x 10)
400 times larger (400x).
This study source was downloaded by 1827175 from cliffsnotes.com on 01-08-2026 18:40:38 GMT -06:00
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https://www.cliffsnotes.com//study-notes/19530141 Module 3 Review Essential Microbiology with Lab Milligan 02A..pdf10/20/2026, 4:09:33 AM
https://www.stuvia.com/user/????????????????????"OP@)(@)(*#@(#*@#&*$^&)(*@)$*$(&(Y&*&%Y&*(@)&$(&%*&%*&(&%@&*($#(*&98o
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Module 3 Review Essential Microbiology
M3: Module 3 Review
Due No due date
Points 5
Questions 16
Time Limit None
Attempt History
Attempt Time Score
LATEST Attempt 1 363 minutes 0 out of 5 *
* Some questions not yet graded
Score for this quiz: 0 out of 5 *
* Some questions not yet graded
Submitted Sep 9 at 3:32pm
This attempt took 363 minutes.
Question 1
Not yet graded / 0 pts
Define the measurements micrometer and nanometer.
Your Answer:
A micrometer is one-millionth of a meter and a nanometer is one-billionth of a meter.
A micrometer (µm) is defined as being one-millionth of a meter and is commonly designated at 10-6
meters. A nanometer (nm) equals 10-9 m or one-billionth of a meter.
Question 2
Not yet graded / 0 pts
What are the two critical factors that influence your ability to see an object?
Your Answer:
Resolution and contrast are the two critical factors that can influence your ability to see an object.
Resolution is how far apart 2 objects are and contrast is the difference in light absorbance between 2
objects.
Resolution and contrast. Resolution refers to the distance between two objects at which the objects
This study source was downloaded by 1827175 from cliffsnotes.com on 01-08-2026 18:40:38 GMT -06:00
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https://www.cliffsnotes.com//study-notes/19530141 Module 3 Review Essential Microbiology with Lab Milligan 02A..pdf10/20/2026, 4:09:33 AM
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Module 3 Review Essential Microbiology
still can be seen as separate. Poor or low resolution means two (or more) objects may appear as one.
The contrast is the difference in light absorbance between two objects. Poor contrast gives a high
background and makes the visualization of multiple objects difficult. For instance, trying to identify 2
dark colored objects at night (low light = low contrast) versus the same 2 objects in the middle of a
sunny afternoon (bright light against 2 dark objects = high contrast).
Question 3
Not yet graded / 0 pts
If you wish to increase the amount of light going into a microscope, what part would you adjust?
Your Answer:
You would have to adjust the iris diaphragm.
The iris diaphragm controls the amount of light that passes through the sample and into the objective
lens. Thus, as you open the iris more light is permitted to pass through to illuminate the sample.
Question 4
Not yet graded / 0 pts
As light passes through a microscope, what is the last piece that light passes before reaching your
eyes?
Your Answer:
The last piece that light would pass through before reaching your eyes is the ocular lens.
Once light passes through the sample and the objective lens it is directed through the ocular lens, or
eyepiece, directly into your eye.
Question 5
Not yet graded / 0 pts
How is the total magnification of an object calculated?
Your Answer:
The total magnification is calculated by multiplying the power of the ocular eyepiece with the power of
the objective lens that your are working with.
Total magnification is calculated by multiplying the power of the objective and the power of the
eyepiece. For instance, a 40x objective with a 10x eyepiece would make an object appear (40 x 10)
400 times larger (400x).
This study source was downloaded by 1827175 from cliffsnotes.com on 01-08-2026 18:40:38 GMT -06:00
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https://www.cliffsnotes.com//study-notes/19530141 Module 3 Review Essential Microbiology with Lab Milligan 02A..pdf10/20/2026, 4:09:33 AM
