BIOD 171 Module 3 Questions with Correct
Answers
True or False: A nanometeris longer than a micrometer.
False. A nanometer is 1,000 times smaller than a micrometer.
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
Assuming a fixed ocular, identify the part of the microscope you would adjust to
enhance the magnification of a sample.
A. Objective
B. Condenser
C. Iris diaphragm
D. Eye piece
A. Only the oculars (eyepiece) and the objectives contribute to the magnification of the
sample. Since the eyepiece is fixed, only the objectives could be altered.
What is the total magnification (relative to your eye) of a sample imaged with a 20x
objective and a 15x eyepiece? Show your math.
20 x 15 = 300x magnification
True or False: Staining is often required to image a cell that is adherent and flat (thin).
True. Adherent, flat and unstained cells are almost invisible due to the limits on both
resolution and contrast. Therefore, cell staining is often required to adequately image the
sample.
Answers
True or False: A nanometeris longer than a micrometer.
False. A nanometer is 1,000 times smaller than a micrometer.
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
Assuming a fixed ocular, identify the part of the microscope you would adjust to
enhance the magnification of a sample.
A. Objective
B. Condenser
C. Iris diaphragm
D. Eye piece
A. Only the oculars (eyepiece) and the objectives contribute to the magnification of the
sample. Since the eyepiece is fixed, only the objectives could be altered.
What is the total magnification (relative to your eye) of a sample imaged with a 20x
objective and a 15x eyepiece? Show your math.
20 x 15 = 300x magnification
True or False: Staining is often required to image a cell that is adherent and flat (thin).
True. Adherent, flat and unstained cells are almost invisible due to the limits on both
resolution and contrast. Therefore, cell staining is often required to adequately image the
sample.
