Question 1
- / 5 pts
Question 2 Not yet graded / 10 pts BIOD 171 Q & A
(Latest 2023 / 2024) Essential
Microbiology Portage Learning Module 3 Exam
M3: Module 3 Exam - Requires Respondus
LockDown Browser + Webcam 2023 / 2024
A nanometer is defined as:
A. 10
-3
B. 10
-6
C. 10
-9
D. 10
-12
C.
B.
D.
A.
Resolution and contrast are two critical factors that influence your ability to see an object. Explain each.
Your Answer:
Resolution is the distance between 2 objects where they are seen as separate objects. 1 / 2
Question 3
- / 3 pts
Question 4 Not yet graded / 5 pts Low resolution results in seeing multiple objects as one object.Contrast is the difference in light absorption between 2 objects. Low contrast produces a high background making multiple objects difficult to see. For example, low contrast is like trying to see dark objects at night and hight contrast is like trying to see dark objects in the light of day.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.Select all that apply.
Iris diaphragm
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.
Eye piece
Condenser
Objective
What is the total magnification (relative to your eye) of a sample imaged with a 20x objective and a 15x eyepiece? Show your math.
Your Answer:
20x X 15x = 300x total magnification
- / 2