©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
Portage Learning microbiology module 3 Practice
Questions and Answers (100% Pass)
A nanometer is defined as: - ✔️✔️10-9
A nanometer is defined as one-billionth of a meter
True or False: A nanometeris longer than a micrometer - ✔️✔️False. A nanometer is
1,000 times
smaller than a micrometer.
Resolution and contrast are two critical factors that influence your ability to see an
object. Explain each. - ✔️✔️Resolution refers to the distance between two objects at
which the objects still can be seen as separate. Poor or low resolution means two (or
more) objects may appear as one. *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).
Assuming a constant (non-adjustable) light source power, identify the part of the
microscope you would adjust to limit the amount of light entering the microscope. -
✔️✔️The iris controls the amount of light that passes through the sample and into the
objective lens. Thus, it can be adjusted (opened or closed) to alter the amount of light.
What is the total magnification (relative to your eye) of a sample imaged with a 60x
objective and a 10x eyepiece? Show your math - ✔️✔️60 x 10 = 600x magnification
1
Portage Learning microbiology module 3 Practice
Questions and Answers (100% Pass)
A nanometer is defined as: - ✔️✔️10-9
A nanometer is defined as one-billionth of a meter
True or False: A nanometeris longer than a micrometer - ✔️✔️False. A nanometer is
1,000 times
smaller than a micrometer.
Resolution and contrast are two critical factors that influence your ability to see an
object. Explain each. - ✔️✔️Resolution refers to the distance between two objects at
which the objects still can be seen as separate. Poor or low resolution means two (or
more) objects may appear as one. *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).
Assuming a constant (non-adjustable) light source power, identify the part of the
microscope you would adjust to limit the amount of light entering the microscope. -
✔️✔️The iris controls the amount of light that passes through the sample and into the
objective lens. Thus, it can be adjusted (opened or closed) to alter the amount of light.
What is the total magnification (relative to your eye) of a sample imaged with a 60x
objective and a 10x eyepiece? Show your math - ✔️✔️60 x 10 = 600x magnification
1
