Question

question 28
(1 point)
the two parts that regulate the amount of light that passes through the ocular are the:
○ fine and coarse adjustment knobs.
○ ocular and objective lenses.
○ illuminator and revolving nosepiece.
○ condenser and diaphragm.
clear selection
question 29
(1 point)
initial focusing of any slide is done with the:
○ high power objective.
○ low power objective.
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Explanation:

For Question 28: The condenser focuses light onto the specimen, and the diaphragm (iris diaphragm) controls the diameter of the light beam, together regulating the amount of light passing through the ocular. Other options have different functions: adjustment knobs control focus, objective/ocular lenses magnify, the illuminator provides light but doesn't regulate it with the nosepiece (which holds objectives).
For Question 29: Initial focusing uses the low power objective because it has a larger field of view and greater depth of field, making it easier to locate the specimen before switching to higher power.

Answer:

Question 28: Condenser and diaphragm.
Question 29: Low power objective.